Question

x+2y=2, 3x+y=21 qual o valor de x e y?

Answer 1

Sistema
x+2y=2
3x+y=21 (-2)

x+2y=2
-6x-2y= -42


-5x=-40
x= -40/-5
x= 8

8+2y=2
2y=2-8
y= -6/2
y= -3