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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 constant speed of mph


  1. Cost in dollars of chocolate bars sold for cents each.

    and are proportional

  1. Number of hours that it takes to drive miles at miles per hour.

    Is rate proportional to time?

  1. Taxi fare for miles driven. The fare is for the first mile, then for each subsequent mile.

    Write an equation for the total taxi fare.
    Is this a proportional relationship?

  1. Time it takes to read mysteries if each book takes hours to read.

    Is this a proportional relationship?