Section D Section D Checkpoint

Problem 1

Decide whether each graph represents a proportional relationship.

A
B
C

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Solution
  1. no
  2. yes
  3. no

Problem 2

A cyclist is training for a race. The graph represents the relationship between her distance traveled and elapsed time during a training ride.

  1. Explain what the labeled point (4,113)(4, 1\frac13) represents in this situation.
  2. Use the graph to find the constant of proportionality for this relationship.
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Solution
  1. It takes her 4 minutes to travel 1131\frac13 miles. 
  2. The constant of proportionality is 13\frac13. This is seen on the graph at the point (1,13)(1, \frac13).