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Big Ideas Math Geometry, 2014

BI

Big Ideas Math Geometry, 2014 View details

3. Postulates and Diagrams

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Exercise 37 Page 88

Use the Subtraction Property of Equality to eliminate the addition.

Solution: x=4
Property: Subtraction Property of Equality

Practice makes perfect

To solve the equation, we have to isolate x on one side. Using the Subtraction Property of Equality, we will subtract 9 from both sides of the equation. This will eliminate the addition and isolate x.

9+x=13

LHS-9=RHS-9

9+x-9=13-9

CommutativePropAdd

Commutative Property of Addition

x+9-9=13-9

Subtract terms

x=4

Subchapter links

Communicate Your Answer p.83

Monitoring Progress p.85-86

Exercises p.87-88