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

A. 3y + 12
B. -3y + 12
C. 3y - 12
D. -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

A. 3y + 12
B. -3y + 12
C. 3y - 12
D. -3y - 12

ivettef365 · Answer

isolate x on equation -x-3y = -12  first move the -3y to the other side and you have
                                  -x = 3y -12  then divide by (-1) so you have the x by itself
                                    x = -3y + 12