Question

Which property of equality can be used to solve the equation n plus nine equals negative three?

Addition Property of Equality

Subtraction Property of Equality

Multiplication Property of Equality

Division Property of Equality

Answer 1

You have
n + 9 = -3

What do you need to do to the 9 on the left side to get rid of it from there, so you end up with n alone?

Answer 2

subtraction?

Answer 3

Right. If you subtract 9 from both sides, you end up with n by itself on the left side and -12 on the right side:
n + 9 = -3
-9 -9
-----------
n = -12

n = -12

So which property was used?