Lin. Inequalities: 3x + 5 < 2x - 1, -15 < 5x < 20

dolampkins

New member
Joined
Jun 4, 2007
Messages
1
Can someone please help me with these problems.

1. 3x + 5 < 2x - 1

2. (2x + 6) > 2(1 - x)

3. -x + 8 > x + 10

4. -15 < 5x < 20

5. -3 < 4x + 5 < 7

6. 8x - 11 < 5

7. -2x > 8

8. 12 > 4 - x > -5

9. 6x + 9 > 21
 

jwpaine

Full Member
Joined
Mar 10, 2007
Messages
723
I'll help you on just one.

Learn how to solve literal http://www.purplemath.com/modules/solvelit.htm equations.

3x+5<2x-1
3x+5-5 < 2x-1-5
3x < 2x-6
3x-2x < 2x-2x-6
x < -6

See? All you do is just switch around like terms and simplify.

Cheers,
John.[/tex]
 
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