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Big Ideas Math: Modeling Real Life, Grade 8

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

Practice Test

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Exercise 1 Page 36

Use the Subtraction Property of Equality to eliminate the addition.

y=5.5

To solve the equation, we have to isolate x on one side. Using the Subtraction Property of Equality, we will subtract 4 from both sides of the equation. This will eliminate the addition and isolate y.

4+y=9.5

LHS-4=RHS-4

4+y-4=9.5-4

Subtract terms

y=5.5

To check that this solution is correct, let's substitute y=5.5 into the original equation and simplify.

4+y=9.5

y= 5.5

4+ 5.5 ? = 9.5

Add terms

9.5 = 9.5 ✓

Since the left-hand side and right-hand side are equal, y=5.5 is the correct solution.

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