Question

what is the solution of the system? use substitution. 2x-y=-7, 4x-y=-4

Answer 1

Rearrange the terms for either equation... Let's say the second equation.

-y = -4x - 4

Substitute that for the first equation and solve for x...

2x - 4x - 4 = -7
-2x - 4 = -7
-2x = -3
x = 3/2

Finally...

2(3/2) - y = -7
3 - y = -7
-y = -10
y = 10

Hence, the solution is (3/2, 10) in terms of (x,y)

I hope this helps!