1. Class Averages
Second %
Third %
Fourth %
Seventh %

2. Test Answers
1. -1/36, 1/216
2. C
3. 40
4. no
7. $256.55
fish
9. y = 200(2.5)^x
10. A
11. growth % mg
15. {24, 192, 384}
16. y = 24000(1-0.15)^x
17. A
amps
19. yes
20. ¾ (0.75)

3. Number 5

4. Parallel Lines

5. In order for two lines to be parallel, they must:
Have the same slope and
Have different y-intercepts.

6. Which lines are parallel?
y = 4x + 2 and y = 2x + 1 and y = 2x - 3
y = -2/3x + 2 and -2x - 3y = -9 and -2y – 3x = 2
y = -2x + 4 and y = 3x + 4 and y = -2x – 1

7. y – y1 = m(x – x1)
Write the equation of a line that is parallel to y = 3x + 2 and goes through the point (2, 4).
y = 3x - 2

8. y – y1 = m(x – x1)
Write the equation of the line that is parallel to 3y – 2x = 6 that goes through the point (3, 5).
y = 2/3x + 3

9. y – y1 = m(x – x1)
Write the equation of the line that goes through the point (-4, 1) and is parallel to 8x – 2y = 7.
y = 4x + 17

10. y – y1 = m(x – x1)
Write the equation of the line that is parallel to y = 4 and goes through the point (3, 6).
y = 6

11. y – y1 = m(x – x1)
Write the equation of the line that is parallel to x = 6 and goes through the point (-2, 4).
x = -2