Question

3x+y=12
x-5y=4

me ajudem a descobrir o valor

Answer 1

$\left \{ {{3x+y=12} \atop {x-5y=4}} \right.$

y = 12-3x

x-5(12-3x)=4
x-60+15x=4
16x=64
x=4

y=12-3x
y-12-3.4
y=12-12
y=0