Question

{x-2y=10
{X-y=7
S(4;3)

Answer 1

{X-2y=10

{x-y=7

{X-2y=10•(-1)

{x-y=7

1){-x+2y=-10

{x-y=7

Y=-3

2)X-2y=10

X-2•(-3)=10

X+6=10

X=10-6

X=4

S(-3,4)