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Determine Whether a Number is a Solution of an Equation

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

x + 13 = 21

  1. x = 8
  2. x = 34

  1. yes
  2. no

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y + 18 = 25

  1. y = 7
  2. y = 43

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m 4 = 13

  1. m = 9
  2. m = 17

  1. no
  2. yes

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n 9 = 6

  1. n = 3
  2. n = 15

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3 p + 6 = 15

  1. p = 3
  2. p = 7

  1. yes
  2. no

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8 q + 4 = 20

  1. q = 2
  2. q = 3

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18 d 9 = 27

  1. d = 1
  2. d = 2

  1. no
  2. yes

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24 f 12 = 60

  1. f = 2
  2. f = 3

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8 u 4 = 4 u + 40

  1. u = 3
  2. u = 11

  1. no
  2. yes

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7 v 3 = 4 v + 36

  1. v = 3
  2. v = 11

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20 h 5 = 15 h + 35

  1. h = 6
  2. h = 8

  1. no
  2. yes

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18 k 3 = 12 k + 33

k = 1

k = 6

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Model the Subtraction Property of Equality

In the following exercises, write the equation modeled by the envelopes and counters and then solve using the subtraction property of equality.

Solve Equations using the Subtraction Property of Equality

In the following exercises, solve each equation using the subtraction property of equality.

Solve Equations using the Addition Property of Equality

In the following exercises, solve each equation using the addition property of equality.

Translate Word Phrase to Algebraic Equations

In the following exercises, translate the given sentence into an algebraic equation.

The sum of 8 and 9 is equal to 17 .

8 + 9 = 17

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The sum of 7 and 9 is equal to 16 .

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The difference of 23 and 19 is equal to 4 .

23 − 19 = 4

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The difference of 29 and 12 is equal to 17 .

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The product of 3 and 9 is equal to 27 .

3 ⋅ 9 = 27

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The product of 6 and 8 is equal to 48 .

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The quotient of 54 and 6 is equal to 9 .

54 ÷ 6 = 9

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The quotient of 42 and 7 is equal to 6 .

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Twice the difference of n and 10 gives 52 .

2( n − 10) = 52

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Twice the difference of m and 14 gives 64 .

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The sum of three times y and 10 is 100 .

3 y + 10 = 100

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The sum of eight times x and 4 is 68 .

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Translate to an Equation and Solve

In the following exercises, translate the given sentence into an algebraic equation and then solve it.

Five more than p is equal to 21 .

p + 5 = 21; p = 16

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Nine more than q is equal to 40 .

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The sum of r and 18 is 73 .

r + 18 = 73; r = 55

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The sum of s and 13 is 68 .

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The difference of d and 30 is equal to 52 .

d − 30 = 52; d = 82

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The difference of c and 25 is equal to 75 .

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12 less than u is 89 .

u − 12 = 89; u = 101

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325 less than c gives 799 .

c − 325 = 799; c = 1124

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299 less than d gives 850 .

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Everyday math

Insurance Vince’s car insurance has a $500 deductible. Find the amount the insurance company will pay, p , for an $1800 claim by solving the equation 500 + p = 1800 .

$1300

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Insurance Marta’s homeowner’s insurance policy has a $750 deductible. The insurance company paid $5800 to repair damages caused by a storm. Find the total cost of the storm damage, d , by solving the equation d 750 = 5800 .

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Sale purchase Arthur bought a suit that was on sale for $120 off. He paid $340 for the suit. Find the original price, p , of the suit by solving the equation p 120 = 340 .

$460

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Sale purchase Rita bought a sofa that was on sale for $1299 . She paid a total of $1409 , including sales tax. Find the amount of the sales tax, t , by solving the equation 1299 + t = 1409 .

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Writing exercises

Is x = 1 a solution to the equation 8 x 2 = 16 6 x ? How do you know?

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Write the equation y 5 = 21 in words. Then make up a word problem for this equation.

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Self check

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

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What does this checklist tell you about your mastery of this section? What steps will you take to improve?

Questions & Answers

what does preconceived mean
sammie Reply
physiological Psychology
Nwosu Reply
How can I develope my cognitive domain
Amanyire Reply
why is communication effective
Dakolo Reply
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
effective communication can lead to improved outcomes in various settings, including personal relationships, business environments, and educational settings. By communicating effectively, individuals can negotiate effectively, solve problems collaboratively, and work towards common goals.
it starts up serve and return practice/assessments.it helps find voice talking therapy also assessments through relaxed conversation.
miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
Wekolamo Reply
please i need answer
Wekolamo
because it helps many people around the world to understand how to interact with other people and understand them well, for example at work (job).
Manix Reply
Agreed 👍 There are many parts of our brains and behaviors, we really need to get to know. Blessings for everyone and happy Sunday!
ARC
A child is a member of community not society elucidate ?
JESSY Reply
Isn't practices worldwide, be it psychology, be it science. isn't much just a false belief of control over something the mind cannot truly comprehend?
Simon Reply
compare and contrast skinner's perspective on personality development on freud
namakula Reply
Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
war
explain how nature and nurture affect the development and later the productivity of an individual.
Amesalu Reply
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
Zyryn Reply
good👍
Jonathan
and having a good philosophy of the world is like a sandwich and a peanut butter 👍
Jonathan
generally amnesi how long yrs memory loss
Kelu Reply
interpersonal relationships
Abdulfatai Reply
What would be the best educational aid(s) for gifted kids/savants?
Heidi Reply
treat them normal, if they want help then give them. that will make everyone happy
Saurabh
What are the treatment for autism?
Magret Reply
hello. autism is a umbrella term. autistic kids have different disorder overlapping. for example. a kid may show symptoms of ADHD and also learning disabilities. before treatment please make sure the kid doesn't have physical disabilities like hearing..vision..speech problem. sometimes these
Jharna
continue.. sometimes due to these physical problems..the diagnosis may be misdiagnosed. treatment for autism. well it depends on the severity. since autistic kids have problems in communicating and adopting to the environment.. it's best to expose the child in situations where the child
Jharna
child interact with other kids under doc supervision. play therapy. speech therapy. Engaging in different activities that activate most parts of the brain.. like drawing..painting. matching color board game. string and beads game. the more you interact with the child the more effective
Jharna
results you'll get.. please consult a therapist to know what suits best on your child. and last as a parent. I know sometimes it's overwhelming to guide a special kid. but trust the process and be strong and patient as a parent.
Jharna
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Source:  OpenStax, Prealgebra. OpenStax CNX. Jul 15, 2016 Download for free at http://legacy.cnx.org/content/col11756/1.9
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