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Big Ideas Math: Modeling Real Life, Grade 8

BI

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

1. Solving Simple Equations

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Exercise 2 Page 4

Use the Subtraction Property of Equality to eliminate the constant on the right-hand side of the equation.

k=- 6

Practice makes perfect

To solve the equation, we have to isolate k on one side. Using the Subtraction Property of Equality, we will subtract 3 from both sides of the equation.

- 3=k+3

LHS-3=RHS-3

- 3-3=k+3-3

Subtract terms

- 6 = k

Rearrange equation

k=-6

To check that this solution is correct, let's substitute k= - 6 into the original equation and simplify.

- 3=k+3

k= - 6

- 3? = - 6+3

Add terms

- 3=- 3 ✓

Since the left-hand side and right-hand side are equal, k=- 6 is the correct solution.

Subchapter links

Try It p.4-6

Self-Assessment for Concepts & Skills p.6

Self-Assessment for Problem Solving p.7

Review & Refresh p.8

Concepts, Skills, & Problem Solving p.8-10