Help Algebra, Will Give 10 Pts To best Answer!?

Question

These are problems i don't remember how to do, please help, thank you alot, show work!

Solve For Y

1. x=12-xy;

2. 4/5x=3/2y-4;

3. 2/3x+1/2y=6;

Solve The Formula For The Indicated Variable

http://img183.imageshack.us/my.php?image=solvenq6.jpg

Solve The Inequality (Write Answers in <b>Interval Form</b> !!!) EX. [2,3)

1. -x+5≥6

2. -5x+1≥1

3. -2<2x-5<3

4. -4<2-x<6

5. 3≤1/2x-1≤5

Thats only a few problems off this 100 problem worksheet.

Thank you! Please Show Work!

Appreciate it!

Answer 1

Solve For Y

1. x=12-xy;

x - 12 = -xy

(x - 12)/-x = y

y = (12 - x)/x

y = 12/x - 1 ← Answer

2. 4/5x=3/2y-4;

4(2y - 4) = 3(5x)

8y - 16 = 15x

8y = 15x + 16

y = (15/8)x + 2 ← Answer

3. 2/3x+1/2y=6;

Is this (2/3)x + (1/2)y = 6 ? If so:

(1/2)y = -(2/3)x + 6

y = -(4/3)x + 12 ← Answer

Worksheet:

7. s = (2h√3)/3

8. s = P/3

9. h = 3V/(πr²)

10. C = (5/9)(F - 32)

11. h = (2A)/(bsub1 + bsub2)

12. bsub2 = [(2A)/h] - bsub1

13. r = s/(2πh)

14. h = V/(πr²)

You will need to put these answers in interval form.

1. -x+5≥6

-x ≥ 1

x ≤ -1 ← Answer

2. -5x+1≥1

-5x ≥ 0

x ≤ 0 ← Answer

3. -2&lt;2x-5&lt;3

3 &lt; 2x &lt; 8

3/2 &lt; x &lt; 4 ← Answer

4. -4&lt;2-x&lt;6

-6 &lt; -x &lt; 4

6 &gt; x &gt; 4 ← Answer

5. 3≤1/2x-1≤5

4 ≤ (1/2)x ≤ 6

8 ≤ x ≤ 12 ← Answer