Suppose consumption C is related to income Y by the equation C = 10 + 0.9Y

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Suppose consumption C is related to income Y by the equation C = 10 + 0.9Y − 0.02Y2.

a. Where does this equation intersect the vertical axis?

b. What is the slope of the line at Y = 0?

c. Does the slope of the line increase or decrease as income increases?

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