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

shamil98 · Answer

solve for x  then.
-x -3y = -12

mertsj · Answer

1.  add 3y to both sides
2.  Multiply both sides by -1

accidentalaichan · Answer

x = 4?

accidentalaichan · Answer

I'm having to find an equation

shamil98 · Answer

not the value of x.

shamil98 · Answer

-x - 3y = -12
-x = 3y - 12
one more step.. divide both sides by -1.

accidentalaichan · Answer

3y - 12?

shamil98 · Answer

Divide everything in
-x = 3y - 12
by -1.

mertsj · Answer

You're supposed to have an equation.  What happened to the x and the equal sign?

accidentalaichan · Answer

None of the choices have an x and equal sign

accidentalaichan · Answer

-3y - 12

shamil98 · Answer

-x = 3y - 12
x = -3y + 12

shamil98 · Answer

you were close but remember
-12/-1 = 12

accidentalaichan · Answer

Thanks ;-; I hate systems of equations.
You're so kind