Question

Use Subsitution:
7x+2y=-6
-14x-4y=-2

Answer 1

how about multiplying the first equation by 2.
and solving it for 4y and plugging that 4y into the equation equation to solve for x

so we have
14x+4y=-12 => 4y=-12-14x
-14x-4y=-2 => -14x-(-12-14x)=-2 => 12 =-2 (not true)

also
if we write both of them in this form y=mx+b
y=-14x/4-12/4

-4y=14x-2 => y=-14x/4+2/4

same slope but different y intercept => lines are parallel => no solution

Answer 2

thank you so much!