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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 13 Page 254

Use the Addition Property of Equality to eliminate the subtraction.

x=20

Practice makes perfect

To solve the equation, we have to isolate x 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 x.

x-8=12

LHS+8=RHS+8

x-8+8=12+8

Add terms

x=20

To check that this solution is correct, let's substitute x=20 into the original equation and simplify.

x - 8 = 12

x= 20

20-8? =12

Subtract term

12=12 ✓

Since the left-hand side and right-hand side are equal, x=20 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