Question

calcule os valores de x e y

a) x+y=7
x-y=1


b) 2x+2=4
x - y= 0

ajudem pfvr :/

Answer 1

a)x=7-y. x+y=7
7-y-y=1. x+3=7
7-2y=1. x=4
-2y=-6
y=3