Пошаговое объяснение:
8y - (7y - 142) = 51
8y - 7y + 142 = 51
y + 142 = 51
y = 51 - 142
y = -91
(6x + 1) - (3 - 2x) = 14
6x + 1 - 3 + 2x = 14
8x - 2 = 14
8x = 14+2
8x = 16
x = 16:8
x = 2
(6 - 2c) + 4 = -5c - 3
6 - 2c + 4 = -5c - 3
10 - 2c = -5c - 3
5c - 2c = -3 - 10
3c = -13
c = -13:3
c = -4 1/3
(10x - 3) + (14x - 4) = 8 - (15 - 22x)
10x - 3 + 14x - 4 = 8 - 15 + 22x
24x - 7 = -7 + 22x
24x - 22x = -7+7
2x = 0
x = 0
(7 - 10k) - (8 - 8k) + (10k + 6) = -8
7 - 10k - 8 + 8k + 10k + 6 = -8
8k + 5 = -8
8x = -8 - 5
8x = -13
x = -13:8
x = -1,625
6y - 20 = 2(5y - 10) - 4y
6y - 20 = 10y - 20 - 4y
6y - 20 = 6y - 20
6y - 6y = 20 - 20
0 = 0
y є (-∞ ; ∞)
уравнение имеет множество решений
6(1 + 5y) = 5(1 + 6y)
6 + 30y = 5 + 30y
30y - 30y = 5 - 6
0 ≠ -1
уравнение не имеет решений
Правильна відповідь
(Г). 1,4,9,16