Question

A math class is having a discussion on how to determine if the expressions 4 x minus x + 5 and 8 minus 3 x minus 3 are equivalent using substitution. The class has suggested four different methods.

Answer 1

4x-x+5 = 8x-3x-3
4x - x = 3x
8x - 3x = 5x
5 = 2x-3
+3
8= 2x
x=4

Answer 2

They are NOT equivalent

Explanation:

4x-x+5 and 8-3x-3

simplify

3x+5 and 5x-3