Question

qual e a resposta? x +2y=5
4x-y=2

Answer 1

$\left \{ {{x+2y=5} \atop {4x-y=2}} \right. \\ \\ \left \{ {{x+2y=5 ^{-4} } \atop {4x-y=2}} \right. \\ \\ \left \{ {{-4x-8y=-20} \atop {4x-y=2}} \right.$
$\left \{ {{} \atop {9y=-18}} \right.$

y = $\frac{-18}{9}$
y = 2

x + 2 × y = 5
x + 2 × 2 = 5
x + 4 = 5
x = 5 - 4
x = 1