Question

Choose the math property used to complete the mathematical step shown below.

x + 15 = 24
x=9

Answer 1

You have to substitute all the x's in the equation by 29:

9 + 15 = 24

Now we solve it:

9 + 15 = 24

24 = 24

↑ Since the numbers match, we can conclude that the equation is indeed true, x = 9.

Hope it helped,

BioTeacher101

Answer 2

x + 15 = 24

subtract 15 from both sides

x = 24 - 15 = 9