### Home > APCALC > Chapter 6 > Lesson 6.1.1 > Problem 6-11

PROPORTIONAL RELATIONSHIPS

In parts (a) through (d) below, decide whether the two given quantities are proportional. If they are, write an equation relating them and state the constant of proportionality, . If they are not proportional, explain why not.

**Example:** Distance traveled (in miles) when driving for

*hours at*

**Solution:** ,

Cost

in dollars ofchocolate bars sold forcents each. andare proportional

Number of hours

that it takes to drivemiles at miles per hour.

Is rate proportional to time?

Taxi fare

formiles driven. The fare isfor the first mile, then for each subsequent mile. Write an equation for the total taxi fare.

Is this a proportional relationship?

Time

it takes to readmysteries if each book takeshours to read.

Is this a proportional relationship?