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To find the equation of the proportional relationship through the origin, we need to determine the ratio of the price to the number of footballs for each data point:
For the data point (1, 9):
9/1 = 9
For the data point (2, 18):
18/2 = 9
For the data point (3, 27):
27/3 = 9
Since the ratio is the same for all data points, we can conclude that the equation of the proportional relationship through the origin is:
y = 9x
Where:
y represents the price of the footballs
x represents the number of footballs