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Connect to Vocabulary
Two quantities have a
proportional relationship
Build Understanding
1
Maxine walks dogs to earn extra money. The table of
values shows the proportional relationship between
the number of dogs Maxine walks and the amount of
money she earns.
if the ratio of one quantity
to the other is a constant
In a proportional
2.
4.
6
Dogs walked
Amount ($)
relationship, the constant
unit rate is called the
constant of proportionality
and is usually represented
7
14
21
by the letter k.
A. Show that the ratio of dogs walked to amount
earned is a constant ratio.
B. Show that the ratio of amount earned to dogs
walked is a constant ratio.
1
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C. What is the unit rate of dogs walked per dollar
earned? Does it make sense? Explain.
D. What is the unit rate of dollars earned per dog walked? Does it
make sense? Explain.
E. What is the constant of proportionality k in this situation?
F. Describe what the unit rate k represents in this situation.