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Verify a Solution of an Equation

In the following exercises, determine whether the given value is a solution to the equation.

Is y = 5 3 a solution of
6 y + 10 = 12 y ?

yes

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Is x = 9 4 a solution of
4 x + 9 = 8 x ?

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Is u = 1 2 a solution of
8 u 1 = 6 u ?

no

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Is v = 1 3 a solution of
9 v 2 = 3 v ?

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Solve Equations using the Subtraction and Addition Properties of Equality

In the following exercises, solve each equation using the Subtraction and Addition Properties of Equality.

y + 45 = −66

y = −111

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p + 2.4 = −9.3

p = −11.7

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m 18 = −200

m = −182

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x 165 = −420

x = −255

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z + 0.52 = −8.5

z = −9.02

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q + 3 4 = 1 2

q = 1 4

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p 2 5 = 2 3

p = 16 15

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Solve Equations that Require Simplification

In the following exercises, solve each equation.

c + 31 10 = 46

c = 25

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9 x + 5 8 x + 14 = 20

x = 1

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6 x + 8 5 x + 16 = 32

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−6 x 11 + 7 x 5 = −16

x = 0

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−8 n 17 + 9 n 4 = −41

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5 ( y 6 ) 4 y = −6

y = 8 y = 24

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9 ( y 2 ) 8 y = −16

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8 ( u + 1.5 ) 7 u = 4.9

u = −7.1

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5 ( w + 2.2 ) 4 w = 9.3

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6 a 5 ( a 2 ) + 9 = −11

a = −30

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8 c 7 ( c 3 ) + 4 = −16

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6 ( y 2 ) 5 y = 4 ( y + 3 )
4 ( y 1 )

y = 28

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9 ( x 1 ) 8 x = −3 ( x + 5 )
+ 3 ( x 5 )

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3 ( 5 n 1 ) 14 n + 9
= 10 ( n 4 ) 6 n 4 ( n + 1 )

n = −50

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2 ( 8 m + 3 ) 15 m 4
= 9 ( m + 6 ) 2 ( m 1 ) 7 m

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( j + 2 ) + 2 j 1 = 5

j = 8

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( k + 7 ) + 2 k + 8 = 7

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( 1 4 a 3 4 ) + 5 4 a = −2

a = 11 4

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( 2 3 d 1 3 ) + 5 3 d = −4

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8 ( 4 x + 5 ) 5 ( 6 x ) x
= 53 6 ( x + 1 ) + 3 ( 2 x + 2 )

x = 13

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6 ( 9 y 1 ) 10 ( 5 y ) 3 y
= 22 4 ( 2 y 12 ) + 8 ( y 6 )

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Translate to an Equation and Solve

In the following exercises, translate to an equation and then solve it.

Nine more than x is equal to 52.

x + 9 = 52 ; x = 43

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The sum of x and −15 is 23.

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Ten less than m is −14 .

m 10 = −14 ; m = −4

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Three less than y is −19 .

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The sum of y and −30 is 40.

y + ( −30 ) = 40 ; y = 70

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Twelve more than p is equal to 67.

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The difference of 9 x and 8 x is 107.

9 x 8 x = 107 ; 107

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The difference of 5 c and 4 c is 602.

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The difference of n and 1 6 is 1 2 .

n 1 6 = 1 2 ; 2 3

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The difference of f and 1 3 is 1 12 .

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The sum of −4 n and 5 n is −82 .

−4 n + 5 n = −82 ; 82

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The sum of −9 m and 10 m is −95 .

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Translate and Solve Applications

In the following exercises, translate into an equation and solve.

Distance Avril rode her bike a total of 18 miles, from home to the library and then to the beach. The distance from Avril’s house to the library is 7 miles. What is the distance from the library to the beach?

11 miles

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Reading Jeff read a total of 54 pages in his History and Sociology textbooks. He read 41 pages in his History textbook. How many pages did he read in his Sociology textbook?

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Age Eva’s daughter is 15 years younger than her son. Eva’s son is 22 years old. How old is her daughter?

7 years old

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Age Pablo’s father is 3 years older than his mother. Pablo’s mother is 42 years old. How old is his father?

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Groceries For a family birthday dinner, Celeste bought a turkey that weighed 5 pounds less than the one she bought for Thanksgiving. The birthday turkey weighed 16 pounds. How much did the Thanksgiving turkey weigh?

21 pounds

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Weight Allie weighs 8 pounds less than her twin sister Lorrie. Allie weighs 124 pounds. How much does Lorrie weigh?

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Health Connor’s temperature was 0.7 degrees higher this morning than it had been last night. His temperature this morning was 101.2 degrees. What was his temperature last night?

100.5 degrees

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Health The nurse reported that Tricia’s daughter had gained 4.2 pounds since her last checkup and now weighs 31.6 pounds. How much did Tricia’s daughter weigh at her last checkup?

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Salary Ron’s paycheck this week was $17.43 less than his paycheck last week. His paycheck this week was $103.76. How much was Ron’s paycheck last week?

$121.19

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Textbooks Melissa’s math book cost $22.85 less than her art book cost. Her math book cost $93.75. How much did her art book cost?

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Everyday math

Construction Miguel wants to drill a hole for a 5 8 inch screw. The hole should be 1 12 inch smaller than the screw. Let d equal the size of the hole he should drill. Solve the equation d 1 12 = 5 8 to see what size the hole should be.

d = 17 24 inch

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Baking Kelsey needs 2 3 cup of sugar for the cookie recipe she wants to make. She only has 3 8 cup of sugar and will borrow the rest from her neighbor. Let s equal the amount of sugar she will borrow. Solve the equation 3 8 + s = 2 3 to find the amount of sugar she should ask to borrow.

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Writing exercises

Is −8 a solution to the equation 3 x = 16 5 x ? How do you know?

No. Justifications will vary.

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What is the first step in your solution to the equation 10 x + 2 = 4 x + 26 ?

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Self check

After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.

This is a table that has six rows and four columns. In the first row, which is a header row, the cells read from left to right “I can…,” “Confidently,” “With some help,” and “No-I don’t get it!” The first column below “I can…” reads “verify a solution of an equation,” “solve equations using the subtraction and addition properties of equality,” “solve equations that require simplification,” “translate to an equation and solve,” and “translate and solve applications.” The rest of the cells are blank.

If most of your checks were:

…confidently. Congratulations! You have achieved your goals in this section! Reflect on the study skills you used so that you can continue to use them. What did you do to become confident of your ability to do these things? Be specific!

…with some help. This must be addressed quickly as topics you do not master become potholes in your road to success. Math is sequential - every topic builds upon previous work. It is important to make sure you have a strong foundation before you move on. Who can you ask for help? Your fellow classmates and instructor are good resources. Is there a place on campus where math tutors are available? Can your study skills be improved?

…no - I don’t get it! This is critical and you must not ignore it. You need to get help immediately or you will quickly be overwhelmed. See your instructor as soon as possible to discuss your situation. Together you can come up with a plan to get you the help you need.

Questions & Answers

it is the relatively stable flow of income
Chidubem Reply
what is circular flow of income
Divine Reply
branches of macroeconomics
SHEDRACK Reply
what is Flexible exchang rate?
poudel Reply
is gdp a reliable measurement of wealth
Atega Reply
introduction to econometrics
Husseini Reply
Hi
mostafa
hi
LEMLEM
hello
Sammol
hi
Mahesh
bi
Ruqayat
hi
Ruqayat
Hi fellas
Nyawa
hey
Sammol
hi
God
hello
Jahara
Good morning
Jorge
hi
abubakar
hi
Nmesoma
hi
Mahesh
Hi
Tom
Why is unemployment rate never zero at full employment?
Priyanka Reply
bcoz of existence of frictional unemployment in our economy.
Umashankar
what is flexible exchang rate?
poudel
due to existence of the pple with disabilities
Abdulraufu
the demand of a good rises, causing the demand for another good to fall
Rushawn Reply
is it possible to leave every good at the same level
Joseph
I don't think so. because check it, if the demand for chicken increases, people will no longer consume fish like they used to causing a fall in the demand for fish
Anuolu
is not really possible to let the value of a goods to be same at the same time.....
Salome
Suppose the inflation rate is 6%, does it mean that all the goods you purchase will cost 6% more than previous year? Provide with reasoning.
Geetha Reply
Not necessarily. To measure the inflation rate economists normally use an averaged price index of a basket of certain goods. So if you purchase goods included in the basket, you will notice that you pay 6% more, otherwise not necessarily.
Waeth
discus major problems of macroeconomics
Alii Reply
what is the problem of macroeconomics
Yoal
Economic growth Stable prices and low unemployment
Ephraim
explain inflationcause and itis degre
Miresa Reply
what is inflation
Getu
increase in general price levels
WEETO
Good day How do I calculate this question: C= 100+5yd G= 2000 T= 2000 I(planned)=200. Suppose the actual output is 3000. What is the level of planned expenditures at this level of output?
Chisomo Reply
how to calculate actual output?
Chisomo
how to calculate the equilibrium income
Beshir
Criteria for determining money supply
Thapase Reply
who we can define macroeconomics in one line
Muhammad
Aggregate demand
Mohammed
C=k100 +9y and i=k50.calculate the equilibrium level of output
Mercy Reply
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Amisha
money as unit of account means what?
Kalombe
A unit of account is something that can be used to value goods and services and make calculations
Jim
all of you please speak in English I can't understand you're language
Muhammad
I want to know how can we define macroeconomics in one line
Muhammad
it must be .9 or 0.9 no Mpc is greater than 1 Y=100+.9Y+50 Y-.9Y=150 0.1Y/0.1=150/0.1 Y=1500
Kalombe
Mercy is it clear?😋
Kalombe
hi can someone help me on this question If a negative shocks shifts the IS curve to the left, what type of policy do you suggest so as to stabilize the level of output? discuss your answer using appropriate graph.
Galge Reply
if interest rate is increased this will will reduce the level of income shifting the curve to the left ◀️
Kalombe
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Source:  OpenStax, Elementary algebra. OpenStax CNX. Jan 18, 2017 Download for free at http://cnx.org/content/col12116/1.2
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