Answer:
6. B
7. A
8. B
9. A
10. A
11. B
12. B
13. A
14. A
15. B
Step-by-step explanation:
6.
a. 5y = -20
5y ÷ 5 = -20 ÷ 5
y = -4
b. -x = -4
-x ÷ (-1) = -4 ÷ (-1)
x = 4
c. -8y = 32
-8y ÷ (-8) = 32 ÷ (-8)
y = -4
d. 3y = -12
3y ÷ 3 = -12 ÷ 3
y = -4
9.
a. 2x - 3 = -9
2x = -9 + 3
2x = - 6
2x ÷ 2 = -6 ÷ 2
x = -3
b. 7 - 2x = 1
-2x = 1 - 7
-2x = -6
-2x ÷ (-2) = -6 ÷ (-2)
x = 3
c. 3x + 1 = 10
3x = 10 - 1
3x = 9
3x ÷ 3 = 9 ÷ 3
x = 3
d. -4x + 5 = 7
-4x = 7 - 5
-4x = 2
-4x ÷ (-4) = 2 ÷ (-4)
x = -2/4 ÷ 2/2
x = -1/2
11.
x + 12 < 20
x < 20 - 12
x < 8
12.
2x + 5 > 11
2x > 11 - 5
2x > 6
2x ÷ 2 > 6 ÷ 2
x > 3
14.
3x + 2 < -5x - 38
3x + 5x < -38 - 2
8x < -40
8x ÷ 8 < -40 ÷ 8
x < -5
15.
3 + x ≤ - 2x
3 ≤ -2x - x
3 ≤ -3x
3 ÷ (-3) ≤ -3x ÷ (-3)
-1 ≤ x
x ≥ -1
