Question

{×+2y=7 { ×-2y=-5 me ajudem

Answer 1

x+2y=7
x-2y=-5

x=-5+2y

-5+2y+2y=7
4y=7+5
4y=12
y=3

x+2y=7
x+2*3=7
x+6=7
x=7-6
x=1