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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

Chapter Review

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Exercise 1 Page 33

Use the Subtraction Property of Equality to eliminate the addition.

y = - 19

Practice makes perfect

To solve the equation, we have to isolate y on one side. Using the Subtraction Property of Equality, we will subtract 8 from both sides of the equation. This will eliminate the addition and isolate y.

y + 8 = - 11

LHS-8=RHS-8

y + 8 - 8 = - 11 - 8

Subtract terms

y = - 19

To check that this solution is correct, let's substitute y=- 19 into the original equation and simplify.

y + 8 = - 11

y= - 19

- 19 + 8? = - 11

Add terms

- 11 = - 11 ✓

Since the left-hand side and right-hand side are equal, y=- 9 is the correct solution.

Subchapter links

1 Solving Simple Equations p.33

2 Solving Multi-Step Equations p.34

3 Solving Equations with Variables on Both Sides p.34-35

4 Rewriting Equations and Formulas p.35