What is the operation used in that step of the proof?
Subtraction Property of Equality
Practice makes perfect
We are given a two-column proof and asked to give a justification to move between the following two statements.
Justification
Let's begin by looking at the first piece of the given information.
m∠ A+46&=90
m∠ A+46-46&=90-46In this step we are subtracting 46 from both sides of the equation. This is justified by the Subtraction Property of Equality.
Ifa=b, thena-c=b-c.
Completed Proof
Given:& ∠ A is the complement of∠ B
& m∠ B=46
Prove:& m∠ A=44
Proof:
