Explain what a point (x,y) on the graph of a proportional relationship means in terms of the situation. Focus special attention on the points (0,0) and (1,r) where r is the unit rate.

Example Problems
A hiker climbs in .
How many meters does the hiker climb per hour?
A carpenter uses 180 nails to assemble 15 frames.
How many nails are used per frame?
A car travels in .
How many
miles per hour does the car travel?
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