Question 9 A curve in the æy-plane is defined by the equation a3 + y? - 12r + 16y = 28. Which of the following statements are true? I. At points where a = -2, the lines tangent to the curve are horizontal. II. At points where y = -8, the lines tangent to the curve are vertical. II. The line tangent to the curve at the point (-1, 1) has slope A I and Il only B Il and III only I and III only D I, II, and II

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