I.Solve each linear equation in one variable.

1) x - 1 = 3

2) -20 = -20n

3) 10a = -120

4) -10 + 2x = -15

5)1 = -8 + 2x

6)5n - 9 = -12

7)-4(6 + a) = -44

8)-20 = 2(-4 + a)

9.-10(7 + n) = -220

10) -22 = 2(7 + v)

11) 16 = 4x + 8

12) 45 = 5(8k - 7)

13) 50 = -2(7x - 4)

14) 3(4 - 5x) - 2(x + 4) = 4

15) -37 = 3 - 5(5 - 3n)

16) -16 = 8(-2 - 2m)

17) 3 = 3(x - 5) - 3(x - 6)

18) -2(6 - 2r) - 2(r + 8) = -12

19) -8(8 + n) - 6(7n - 3) = 54

20) 5(8 - 6b) - 5(2 - 3b) = -60

II.Solve the following equation in two variables:

1.8x 6y = 20

16x + 7y = 30

2.16) 6x 12y = 24

x 6y = 4

3.17) 8x 10y = 24

6x + 5y = 2

4.4y 11x = 36

20 = 10x 10y

5.9 + 5y = 4x

11x = 20 + 9y

6.0 = 2y + 10 6x

14 22y = 18x

7.16y = 22 + 6x

11y 4x = 15

8.16 + 20x 8y = 0

36 = 18y 22x

9.y = 4x 9

y = x - 3

10.x + 7y = 0

2x 8y = 22