Question

Which property of equality can be used to justify this step?

15 - 10x = 6x
+ 10x + 10x
————————
15 = 16x


A. Substitution Property of Equality
B. Summation Property of Equality
C. Addition Property of Equality
D. Subtraction Property of Equality

Answer 1

C. Addition property of Equality

Answer 2

C. Addition Property of Equality
because you are adding 10x to both sides