1) (-1;-2)
3х-4у=b
3 * (-1) - 4 * (-2) = b
-3 + 8 = b
5 = b
ответ : b = 5
2) (-1;-2)
bx-2у=13
b * (-1) - 2 * (-2) = 13
-b + 4 = 13
-b = 13 - 4
-b = 9
b = -9
ответ : b = -9
1) (-1;-2)
3х-4у=b
3 * (-1) - 4 * (-2) = b
-3 + 8 = b
5 = b
ответ : b = 5
2) (-1;-2)
bx-2у=13
b * (-1) - 2 * (-2) = 13
-b + 4 = 13
-b = 13 - 4
-b = 9
b = -9
ответ : b = -9