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McGraw Hill Glencoe Geometry, 2012 View details

8. Proving Angle Relationships

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Exercise 43 Page 159

In the equation, b has been replaced by 3.

Substitution Property

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To identify the property being demonstrated by the given equations, we should first identify the operation being performed. Ifa- b=xand b= 3, thena- 3=x. In this case, b has been replaced by 3 in the equation. This demonstrates the Substitution Property of Equality.