13.

a) The

*represents*

**d****d**istance. The

*t*represents

**t**ime.

b) The 15 represents how many kilometers Craig travels per hour.

c)

d)

e) It is reasonable to have points between the ones on the graph because you can have part of an hour. For example, you can have an hour and 30 minutes.

f) Craig would travel 120km in 8 hours.

I got this answer by using the formula:

*d*= 15

*t*

*d*= 15(8)

*d =*120

Practice Test, Page 362

In this situation,

*t =*-1. (Or the x coordinate.)

Now, you use the formula that was given to find

*s*, or the y coordinate.

*s*= -4

*t*+ 2 formula

*s*= -4(-1) + 2 substitution

*s*= 4 + 2 solve

*s*= 6 answer

Practice Test, Page 363

a) The price per Zap is $3. (As shown on the graph.)

b) The x-axis goes up by 1.

The y-axis goes up by 3.

The coordinates go over 1, up 3.

c) (

**0**,**0**) would represent**0**cans for**0**dollars.
a)

b)

*b*= 4*f**b*= 4(60)

*b*= 240

There would be 240 black dots in Figure 60.

Click here to practice plotting.

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