Question

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

Answer 1

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

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

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

$x = 18 \ y = 6$