Question

Determine which equation below has a solution of x = 2.
A.
5x + 8 – 12x = –6x + 2x – 3
B.
6x + 4 – 12x = –10x + 18x – 3
C.
–4x – 6 + x = –2x + x – 10
D.
–3x – 8 + x = –4x + x – 10

Answer 1

5x + 8 - 12x = -6x + 2x - 3
-7x + 8 = -4x - 3
(isolating the variable)
-3x = -11
So not the first one
Just keep cancaling out the ones that won't work

Answer 2

You can do this two different ways.
You can plug in 2 into each equation and see which gives you a true statement.
2=2 or 0=0 or 1=1 or something like is a true statement
2=5 or -6=1 is not a true statement


or
you could solve each of them

Answer 3

–4x – 6 + x = –2x + x – 10
-4(2)-6+2=-2(2)+2-10
-8-6+2=-4+2-10
-12=-12