Question

{У=4-5х
{У-7х=-8
помогите

Answer 1

{y=4-5x
{y-7x=-8 => 4-5x-7x=-8

4-5x-7x=-8
-12x=-8-4
-12x=-12
x=1

y=4-5*1
y=4-5
y=-1