Big Ideas Math: Modeling Real Life, Grade 7
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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
p - 5 + 5 = - 2 + 5
p = 3
To check that this solution is correct, let's substitute p=3 into the original equation and simplify.
p - 5 = - 2
3 - 5? =- 2
- 2 = - 2 âś“
Since the left-hand side and right-hand side are equal, p=3 is the correct solution.