Question

Решите систему уравнений:
2х-у=18
2х+3у=2

Answer 1

$y = 2x - 18 \ 2x + 3y = 2 \ 2x + 3(2x - 18) = 2 \ 2x + 6x - 54 = 2 \ 8x = 56 \ x = 7 \ 2 times 7 + 3y = 2 \ 14 + 3y = 2 \ 3y = - 12 \ y = - 4$