Question

Решите систему уравнений х+5y=48, 7x+y=132

Answer 1

$x + 5y = 48 \\ 7x + y = 132$

$x = 48 - 5y \\ 7(48 - 5y) + y = 132$

$x = 48 - 5 \times 6 \\ y = 6$

$x = 18 \\ y = 6$