Question

medal for whoever answers this question ASAP!
For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

-x - 2y = -4
3x + y = 12

-2y - 4

2y - 4

2y + 4

-2y + 4

Answer 1

You need to get x all by itself in the first equation:
\[-x -2y=-4\]We want to move everything away from the x. Start by adding 2y to both sides:
\[-x=-4 + 2y\]Finally, multiply both sides by negative 1:
\[x=4-2y\]

Answer 2

thank you!