Question

{-7, 12х + 3,9у - 3,22 =0. {-2, 88х +3, 9у -6, 78=0​

Answer 1

3,9y=7,12x+3,22
-3,9y=2,88x+6,78

3,9y=7,12x+3,22
3,9y=-2,88x-6,78

7,12x+3,22=-2,88x-6,78
x=-1

3,9y=-2,88*(-1)-6,78
y=-1

(x,y)=(-1; -1)