Question

RESOLVA USANDO METADO DA SUBSTITUIÇÃO
2X-5Y=8
x-2y=3

Answer 1

x-2y = 3            2x-5y = 8                                 

x = 3+2y           2 . (3+2y)-5y = 8

x = 3+2*-2         6+4y-5y = 8-6

 x = 3-4             4y-5y = 8-6

 x = -1                 -y = 2      (* -1)

                          y = -2

S = {(-1,-2)}

Mil desculpas errei na primeira!

Answer 2

X=2y+3
2.(2y+3)-5y=8
4y+6-5y=8
-y=8-6
y=-2
x-2.(-2)=3
x=3-4
X=-1
y=-2