Question

2x+y=9
X-3y=-13
Como calculo o valor de x e y?

Answer 1

{2x+y=9 ===> y=9 -2x

{X-3y=-13

x-3(9-2x)=13

x-27+6x=13

x-6x =13 +27

-5x = 40

x =-8 ✓ ===> y=9 +16=25 ✓