Equivalent expressions of functions
Describing a trip
Students went on a trip
from their school to a lake and gave different accounts of the trip.
For each account write a correspondence rule
that describes the dependence of the
distance of the students to the lake on time. Try to
write a correspondence rule that
emphasizes the information in the account using one of the standard forms
f(x)=ax+b , f(x)=a(x-c) , or f(x)=a(x-c)+m .
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Alex:
The trip ended at the lake, which was 15 kilometers
from the school. We walked at a speed of 5 kilometers
per hour.
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| Ricky:
The trip lasted 3 hours. Our walking-speed was 5
kilometers per hour.
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| Shelly:
We walked at a speed of 5 kilometers per hour. After 2 hours
we were 5 kilometers from the lake.
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