Enter the missing reasons for the following two-column proof. Given: M is the midpoint of CD;CM = 3x - 10; MD = 6x -22

Prove: x=4

Statement Reason
M is the midpoint of CD;CM = 3x - 10; MD = 6x - 22 1. ?
CM = MD 2. ?
3x - 10 = 6x - 22 Substitution
-3x - 10 = -22 Subtraction Property of Equality
-3x = -12 3. ?
x = 4 Division Property of Equality

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