Cash's Final Review

Solving for X

100

2x = 6 - x 

x = 2

200

3x + 7 = 4x - 8

15

300

2(x + 3) - 8 = 32

x = 9

400

3(2x - 5) + 10 = 2 + x 

x = 7/5

500

4(3x - x) + 20 = 0

12.5

Compound Inequalities

100

x > 2 or x < -2 

(-infin, -2), (2, infin) 

200

2x <= 2 or 3x >== 6

(-infin, 1], [2, infin)

300

x - 2 < -8 or x / 8 > 1 

(-infin, -6), (8, infin)

400

-1 + x =< 9 - 4x or 9 + n > 17

(-infin, 2], (6, infin) 

500

-2x + 6 <= 4 + 2x and x + 2 >= -4

[-6, 1/2]

Finding Solutions

100

y = x + 3

y = 2 -x 

(-1/2, 3.5) 

200

y = 4 - x 

y = 2x + 4 

(0, 4)

300

2y = 4x + 6 

x = 2 - 2y

( 4/5, 7/5)

400

6y = 2 - 4x

4x + 5 = 3y 

(-2, -1) 

500

5y - 2 = 10x + 8

4 - 6x = 2y + 10

(-1, 0) 

Adding equations

100

-x + 3 = y 

x-4 = y

y = -1/2

200

2x + 2 = 2y

3x - 9 = -y

(2, 3)

300

3(x-8) + 4 = y

2x + 6 = y

(26, 58)

400

6(x + 1) - 6 = 3 + y 

-6x x- 8 = 2 + y

(-7/12, -13/2) 

500

freebie! 

no answer you just get points!