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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

what is biology
Hajah Reply
the study of living organisms and their interactions with one another and their environments
AI-Robot
what is biology
Victoria Reply
HOW CAN MAN ORGAN FUNCTION
Alfred Reply
the diagram of the digestive system
Assiatu Reply
allimentary cannel
Ogenrwot
How does twins formed
William Reply
They formed in two ways first when one sperm and one egg are splited by mitosis or two sperm and two eggs join together
Oluwatobi
what is genetics
Josephine Reply
Genetics is the study of heredity
Misack
how does twins formed?
Misack
What is manual
Hassan Reply
discuss biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles
Joseph Reply
what is biology
Yousuf Reply
the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
Joseph Reply
what is the blood cells
Shaker Reply
list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
Abdullahi Reply
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
Abdullahi
cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
DENG
cells is the basic structure and functions of all living things
Ramadan
What is classification
ISCONT Reply
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
Kenna Reply
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
Hilary
cell is the building block of life.
Condoleezza Reply
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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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