Question

10,11,12,13,15,16,17,18​

Answer 1

#10
-2 + 2y = 11
2y = 13
Y = 6.5

#11
5x = 20
X = 4

#12
0.4y = -4
Y = -10

#13
1.5x - 2.1 = 0.6x + 9.6
0.9x = 11.7
x = 11.7 / 0.9 = 117 / 9 = 13

#15
(1.4x - 3.5) * (-1.5) = 0.25 * (4.6x - 18)
-2.1x + 5.25 = 1.15x - 4.5
3.25x = 9.75
X = 3

#16
29/9 * x - 29/12 = 7/3 * x - 7/4
8/9 * x = 8/12
X = 3/4 = 0.75

#17
5/12 - 4m = 4/3(3/2 * m - 3/8)
5/12 - 4m = 2m - 1/2
6m = 11/12
M = 11/72

#18
X1 = 0
(X - 5)(x + 2.5) = 0
X2 = 5
X3 = -2.5