7th Grade Math

Extra Practice EP19

Extra Practice

Multi-Part Lesson 7-1 (continued)

PARTS C D PAGES 385–390

Graph the function represented by the table.

1. Total Cost of Tennis Balls
   Number of
   Tennis Balls Total Cost ($)
   3 6
   4 8
   510
   612


2. Convert Gallons to Quarts
   Gallon Quarts
   1 4
   2 8
   312
   416

Graph each equation.

3. y = 3 x 4. y = 2 x + 3 5. y = - x


4. y = 0.5x + 2 7. y = - x + 3 8. y = 0.25x + 6

Multi-Part Lesson 7-2: Slope

PARTS A B PAGES 391–395

Find the rate of change for each table.

1. Age (yr) Height (in.)
   954
   10 56
   11 58
   12 60
   2. Time (h) Temperature (°C)
   00
   43
   86
   12 9


2. MOVIE RENTALS The graph shows

Cost ($)

0

20

15

10

5

123

Number of Movies

(1, 5)

(2, 10)

(3, 15)

x

y

Renting Movies

the cost of renting movies. Use the

graph to find the rate of change.

PARTS C D PAGES 396–400

1. Find the slope of the line at the right and describe Baking Cookies

42812 20

Cookies

16

6

8

10

12

14

4

Flour Remaining (c) 2

(^0) x
what happens when the amount of flour decreases. (^) y

2. The table below shows the number of apples y per
   basket x. Find the slope of the line.

Baskets 2468

Apples 10 20 30 40

EP2_EP36_ExtPract_M1_895130.indd EP19 1/6/10 11:46 AM