So, we have the point (84, 7).
Second, we know that when 54 units are sold, the price is $9. So, we have the point (54, 9).
Now, we can find the slope (m) of the line using the formula:
m = (y2 - y1) / (x2 - x1)
Plugging in the points (84, 7) and (54, 9), we
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