Algebra, tues 12/9

we reviewed our study guide, in preparation for tomorrow's test. Students may use the study guide to help them with the test. We reviewed the items that they requested in detail and answers to all items follow (I can't make graphs here -- for the items with graphs, I'll just describe them)
1. false, rate of change can be negative, positive, zero or undefined
2. false, it's undefined
3. slope = 3
4. slope = -3/2
5. y-int = 3, x-int=6
6. y-int=-4, x-int=4/3
7. y-int=-3, m=1/2
8. goes through point (3,2), m=-2
9. y=2/3 x -3
10. y=1/4 x + 5
11. y = -2/3 x + 3
12. y = 7/3 x + 4
13, (0,2) (4,0)
14. (0,-8), (24/5, 0)
15. (0,12), (-6,0)
16. (0,-5), (5,0)
17. y+2=1/4 x
18. y-1=-2 x
19. y-2=-7/6 x
20. y+3=-8/3(x-3)
21. y=-2x+7
22.y=-2/7 x -4/7
23. y=-4
24. y=3/5 x + 4/5
25 a) neither b)parallel (actually, they coincide) c)perpendicular d) neither
26. y=-1/2 x + 7/2
27. x=-7
28. y=-1/4 x + 1/4
29. x = 4
30 a) 0.5 x + 0.8 y = 240
Others were reviewed in detail on the board.

We'll have a pre-school study session in my room -- anyone is welcome to come & participate.