The price at which equilibrium is achieved is $9
The equilibrium point is the point where the lines of the demand and supply functions meet.
From the question, we understand that price is plotted on the vertical axis (i.e. the y-axis).
Also from the question, the lines intersect at point (30,9).
The y-coordinate of the intersection point is 9
Hence, the price at which equilibrium is achieved is $9
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