Question

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the first equation is substituted into the second equation.
12x – y = –4
4x – 3y = –6
Answer
4x – 3(–12x – 4) = –6

4(12x + 4) – 3y = –6

4(–12x – 4) – 3y = –6

4x – 3(12x + 4) = –6

Answer 1

12x – y = –4 rearranging this first one we get
12x + 4 = y

substituting this in second equation we get
4x – 3(12x + 4) = –6 i.e the last one

Answer 2

12x-y = -4
12x+4 = y

4x-3(12x+4)=-6
4x-36-12=-6
4x-48=-6
4x=42
x=14