Question

Resolva o sistema
2x+3y=0
-x+2y=7

Answer 1

-x+2y=7 (×2)

-2x+4y=14
+2x+3y=0
0x+7y=14
y = 7/14
y = 2

2x+3(2)=0
2x= -6
x= -6/2= -3
s={-3,2}