Question

x+y=9 x+4y=23 preciso de ajudar

Answer 1

x+y=9
x+4y=23

x+y=9
x=9-y

x+4y=23
9-y+4y=23
4y-y=23-9
3y=14
y=14/3

x+y=9
x+14/3=9
x=9-14/3
x=27/3-14/3
x=13/3

Espero ter ajudado :)