7th Grade Math

Test PracticeT

Lesson 1C Rates and Functions 389

21. OPEN ENDED Draw the graph of a linear function. Name three ordered
    pairs that satisfy the function.


22. CHALLENGE Darrell has recorded the
    greenhouse temperature at certain times of
    the day in the table. The greenhouse was
    advertised to maintain temperatures between
    65°F and 85°F.
    a. What is the rate of increase as a unit rate?
    b. Create a new table that shows the
    temperatures recorded hourly from 1:00 a.m.
    to 8:00 a.m. using the given data in the table.
    c. Create a graph of the time and temperatures
    from midnight to 9:00 a.m. Is the relationship
    linear? Explain.


23. E WRITE MATH Name a set of ordered pairs that does not represent a
    function. Explain your reasoning.

C

24. The graph shows the relationship
    between the number of hours Serefina
    spent jogging and the total number of
    miles she jogged. Which table best
    represents the data in the graph?

A. Time

(h)

Distance

(mi)

64

12 3

18 2

24 1

B. Time

(h)

Distance

(mi)

26

312

418

524

C. Time

(h)

Distance

(mi)

16

214

318

424

D. Time

(h)

Distance

(mi)

46

36

26

16

1234

Distance (mi)

30

25

20

15

10

5

0

Time (h)

Serefina’s Jogging Log

Time Temperature (°F)

1:00 A.M.66

3:00 A.M.71

6:00 A.M. 78.5

8:00 A.M. 83.5

25. Which ordered pair is NOT a solution of y = 5 x + 2?
    F. (0, 5) H. (2, 12)
    G. (1, 7) I. (3, 17)

385_390_C07_L1_895130.indd 389 12/31/09 4:24 PM