Question

me ajudem por favor!!

Answer 1

{x-2y =3
{2x+y=11 *(2)
{x-2y=3
{4x+2y=22
---------------
5x=25
x=25/5
x=5

x-2y=3
5-2y=3
-2y=3-5
-2y=-2*(-1)
2y=2y
y=2/2
y=1

s={(5,1)}