For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation?

2x + y = 8
-x - 3y = -12

3y + 12

-3y + 12

3y - 12

-3y - 12

Question

For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation?

2x + y = 8
-x - 3y = -12

 3y + 12

 -3y + 12

 3y - 12

 -3y - 12

anonymous · Answer

x=3y+12

I'd substitute in 3y+12

anonymous · Answer

Rearrange the second equation for x;

x = 12 - 3y