Question

metodo adição x-y=3 2x+3y=16

Answer 1

$\left \{ {{x-y=3} \atop {2x+3y=16}} \right.$

x-y=3 (3)
3x-3y=9

adicionando:

3x+2x-3y+3y=+9+16
5x=25
x=5

x-y=3
5-y=3
-y=-5+3
-y=-2
y=2