A graph is proportional if a straight line can be drawn through the points and it crosses through the origin. A proportional relationship for objects occurs when the object number increases or decreases and a value of the object increases or decreases at a consistent rate.
1. C
A line can be drawn through the points, however it would not cross through the origin.
2. A
As the number of hours increases by 1, the dollars earned increases by $12.50. This increase in dollars earned is consistent across all increases in hours.
3. 4 gallons of milk for $13.16, 5 gallons of milk for $16.45, 9 gallons of milk for $29.61
If we check all of the options by multiplying the number of gallons by the given price per gallon, the following relationships are proportional to the original.
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