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

Example Problems
Graph the line that represents a proportional relationship between y and x with the property that an increase of 6 units in x corresponds to an increase of 7 units in y.
Graph the line that represents a proportional relationship between y and x with the property that an increase of 12 units in x corresponds to an increase of 11 units in y.
Graph the line that represents a proportional relationship between and with the property that an increase of corresponds to an increase of .
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