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Big Ideas Math: Modeling Real Life, Grade 7

BI

Big Ideas Math: Modeling Real Life, Grade 7 View details

4. Writing and Graphing Inequalities

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Exercise 1 Page 149

Use the Addition Property of Equality to eliminate the subtraction.

p=11

Practice makes perfect

To solve the equation, we have to isolate p on one side. Using the Addition Property of Equality, we will add 8 to both sides of the equation. This will eliminate the subtraction and isolate p.

p - 8 = 3

LHS+8=RHS+8

p - 8 + 8 = 3 + 8

Add terms

p = 11

To check that this solution is correct, let's substitute p = 11 into the original equation and simplify.

p - 8 = 3

p= 11

11 - 8 ? = 3

Subtract term

3 = 3 ✓

Since the left-hand side and right-hand side are equal, p = 11 is the correct solution.

Subchapter links

Try It p.146-147

Self-Assessment for Concept & Skills p.147

Self-Assessment for Problem Solving p.148

Review & Refresh p.149

Concept, Skills, & Problem Solving p.149-150