Respuesta :

apologiabiology
multiply second equation by -2
2x-y=1
mmultiply -2
-4x+2y=-2
add to first equation
5x-4x+2x-2x=4-2
x=2
subsitute
2(2)-y=1
4-y=1
subtrac 4
-y=-3
y=3

x=2
y=3