24x - y = 24 | * 10
240x - 10y = 240
(12x + 10y) + (240x - 10y) = -12 + 240
12x + 240x + 10y - 10y = 228
252x = 228
x = 228 / 252
x = 19 / 21
24 * (19 / 21) - y = 24
(8 * 19) / 7 - y = 24
152 / 7 - y = 24
y = 152 / 7 - 24
y = 152 / 7 - (24 * 7) / 7
y = 152 / 7 - 168 / 7
y = -16 / 7
Ответ: x = 19/21, y = -16/7