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Big Ideas Math: Modeling Real Life, Grade 6

BI

Big Ideas Math: Modeling Real Life, Grade 6 View details

2. Solving Equations Using Addition or Subtraction

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Exercise 7 Page 253

Use the Addition Property of Equality to eliminate the subtraction.

r=21

Practice makes perfect

To solve the equation, we have to isolate r on one side. Using the Addition Property of Equality, we will add 6 to both sides of the equation. This will eliminate the subtraction and isolate r.

15 = r - 6

LHS+6=RHS+6

15+6= r-6+6

Add terms

21=r

Rearrange equation

r = 21

To check that this solution is correct, let's substitute r=21 into the original equation and simplify.

15 = r - 6

r= 21

15? = 21 - 6

Subtract term

15=15 ✓

Since the left-hand side and right-hand side are equal, r=21 is the correct solution.

Subchapter links

Try It p.252-254

Self-Assessment for Concepts & Skills p.254

Self-Assessment for Problem Solving p.255

Review & Refresh p.256

Concepts, Skills, & Problem Solving p.256-258