Question

Qual a solução de:

-2x + 2y = -6
x -3y = 5

Answer 1

-2x+2y=-6
x  - 3 y=5 (*2)

-2x+2y=6
2x - 6y=10

-4y=16                   x - 3(-4) = 5
y=-4                       x +12=5           x=-7

Answer 2

-2x+2y=-6
 x-3y=5  ---> x=5+3y

-2x+2y=-6
-2(5+3y)+2y=-6
-10-6y+2y=-6
-6y+2y=-6+10
-4y=4(-1)
4y=-4
y=-4/4
y=-1

x-3y=5
x-3.(-1)=5
x+3=5
x=5-3
x=2