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

The answer is 4x - 3(12x + 4) = -6

The system of equations is:
12x – y = –4
4x – 3y = –6

Step 1: rearrange the first equation for y.
Step 2: substitute y from the first equation into the second one.

Step 1:
The first equation is:                         12x – y = –4
After rearrangement it looks like:    y = 12x + 4

Step 2:
Substitute y from the first equation (y = 12x + 4) into the second equation:
4x – 3y = –6
4x - 3(12x + 4) = -6

Therefore, the fourth choice is correct.

Move the decimal behind it

Igot the answer of 15.8 years.