Question

metodo da substitiçao
3x+Y=13 EM BAIXO 2X-Y=13

Answer 1

{3x+y=13
{2x-y=13

y=13-3x
2x-13+3x=13
5x=13+13
5x=26
x=26/5

y=13-3x
y=13-3.26/5
y=13-78/5
y=65-78
y=-13

(26/5,-13)