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Big Ideas Math: Modeling Real Life, Grade 7
BI
Big Ideas Math: Modeling Real Life, Grade 7 View details
1. Solving Equations Using Addition or Subtraction
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Exercise 1 Page 128

Use the Addition Property of Equality to eliminate the subtraction.

p=3

Practice makes perfect

To solve the equation, we have to isolate p on one side. Using the Addition Property of Equality, we will add 5 to both sides of the equation. This will eliminate the subtraction and isolate p.

p - 5 = - 2
AddEqn

LHS+5=RHS+5

p - 5 + 5 = - 2 + 5
AddTerms

Add terms

p = 3

To check that this solution is correct, let's substitute p=3 into the original equation and simplify.

p - 5 = - 2
Substitute

p= 3

3 - 5? =- 2
SubTerm

Subtract term

- 2 = - 2 ✓

Since the left-hand side and right-hand side are equal, p=3 is the correct solution.

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arrow_right Try It p.128-129
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Try It 2 (Page 128)
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arrow_right Self-Assessment for Concept & Skills p.129
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arrow_right Self-Assessment for Problem Solving p.130
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