Question

Resolva o sistema escalonado.

4x-2y+3z=4
6y+5z=40
2z=4

Answer 1

$z = \frac{4}{2 } \\ z = 2$
$4x - 2y + 3 \times 2 = 4 \\ 4x - 2y = - 2$
$6y + 5 \times 2 = 40 \\ 6y + 10 = 40 \\ 6y = 40 - 10 \\ y = \frac{30}{6} \\ y = 5$