Question

Решите пожалуйста 3)))

Answer 1

{10-4(2x+5)=6y-13
{4y-63=5(4x-2y)+2
{10-8x-20=6y-13
{4y-63=20x-10y+2
{-8x-6y=-13-10+20
{4y-20x+10y=2+63
{-8x-6y=-3
{-20x+14y=65|*2
{-8x-6y=-3|*5
-{-40x+28y=130
-{-40x-30y=-15
58y=145|:58
y=2 29/58=2,5
-8x-6*2,5=-3
-8x=-3+15
-8x=12|:(-8)
x=-1.5