Question

x+2y=5
13x - 2y = -25​

Answer 1

somarei as equações

$x + 2y = 5 \\ 13x - 2y = - 25 \\ \\ 14x = - 20 \\ x = \frac{10}{7}$

$\frac{10}{7} + 2y = 5 \\ \frac{10 + 14y}{7} = 5 \\ 10 + 14y = 35 \\ 14y = 25 \\ y = \frac{25}{14}$