Question

Find the solution of this system of equations.
-2x-4y=42
2x-8y=18

Answer 1

lets say we take your first equation and subtract the second equations from it

Answer 2

that being

-2x-4y=42
2x-8y=18

-2+2x-4y+(-8y) = 42 +18

Answer 3

-2x+2x-4y+(-8y) = 42 +18 (CORRECTED)

and I also meant to say add both the equations together. sorry for the mix up

Answer 4

so therefore

-2x+2x-4y+(-8y) = 42 +18

-12y = 60
y = 60/ -12
y = -5

sub y = -5 into 2x-8y=18

2x - 8(-5) = 18
2x + 40 =18
2x = 18-40
x = -11