Question

Qual o valor de X e Y?
x+2y=1
2x-y=7

Answer 1

x+2y= 1
2x-y=7 >>> 4x-2y=14


4x-2y+(x+2y)=14+(1)
4x-2y+x+2y=14+1
5x=15
x=15/5
x=3

x+2y=1
(3)+2y=1
3+2y=1
2y=1-3
2y=-2
y=-2/2
y=-1



x=3
y=-1