Question

Resolva: {x+y=1 {3x-5y=-17

Answer 1

x=1-y

3(1-y)-5y=-17
3-3y-5y=-17
-3y-5y=-17-3
-8y=-20
y=20/8
y=5/2

x+y=1
x+5/2=1
2x+5=1
2
2x+5=1.2
2x=2-5
2x=-3
x=-3/2

-3/2 ; 5/2