Homework Help: Algebra

Posted by Loreal on Sunday, December 23, 2007 at 1:48pm.

1. Evaluate. (8 – 3) (12 ÷ 2 • 2) – 20

Answer: I'm not sure if its -5 or 40

2. 6x – 7 = 5(x – 2)

Answer: -3

3. Solve for y. 3x – 2y = 12

Answer: 3x-12/2

4. Solve. –3(x – 3) + 8(x – 3) = x – 9

Answer: 1 1/2 or 1.5

5. Find the slope of the line passing through the points (8, 3) and (–2, 4).

Answer: -1/10

6. Find the slope of the line passing through the points (10, –4) and (–4, –4).

Answer: 0

7. A plane took 1 hour longer to travel 560 miles on the first portion of a flight than it took to fly 480 miles on the second portion. If the speed was the same for each portion, what was the flying time for the second part of the trip?

Answer: 6hrs

8. Given f(x) = 2x2 – 3x + 5, find f(5).

Answer: 40

9. Rewrite the equation 4x – 2y = –6 as a function of x

Answer: f(x) = 2x + 3

10. Are the following lines parallel, perpendicular, or neither?
L1 with equation x – 2y = 10
L2 with equation 2x + y = 2

Answer: perpendicular

Algebra - Damon, Sunday, December 23, 2007 at 2:58pm
1. 5*3 - 20 = -5
2. right
3. (3x-12)/2 need parenthesis
4. –3(x – 3) + 8(x – 3) = x – 9
-3x+9+8x-24=x-9
4x = -42
x = -21/2 or - 10 1/2
5. right
6. right
7. right
8. right
9. right
10. right 1/2 = -1/(-2)
Algebra - Damon, Monday, December 24, 2007 at 3:40pm
Whoa - #1
I did not finish correctly
(8 – 3) (12 ÷ 2 • 2) – 20
(5)(6*2) -20
(5)(12) - 20
60 - 20
40

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