Question

Solve by substitution:
2x-y = -5
-x+-y =10

Answer 1

2x-y=-5
-x-y=10
3x=-15
x=-5
-10-y=-5
-y=-5+10
-y=5
y=-5
HOPE I HELPED!!!

Answer 2

{2x-y = -5 => -y=-5-2x /*(-1) y=2x+5
{-x+-y =10

Substitute y in the second equation:

-x-y=10

-x-(2x+5)=10

-x-2x-5=10

-3x-5=10 /+5

-3x=15 /:(-3)

x=-5

y=2x+5=2*(-5)+5=-10+5=-5

y=-5

Solution: (-5; -5)