Question: Let P(3, 4) be a point on the circle x2 + y2 = 25 (see figure). (a) What is the slope of the line joining

Let P(3, 4) be a point on the circle x2 + y2 = 25 (see figure).

(a) What is the slope of the line joining P and O(0, 0)?

(b) Find an equation of the tangent line to the circle at P.

(c) Let Q(x, y) be another point on the circle in the first quadrant. Find the slope mx of the line joining P and Q in terms of x.

(d) Calculate lim x→3 mx. How does this number relate to your answer in part (b)?

-6 -2 2 -6+ Figure for 4 2 P(3, 4) Q 6

X 

-6 -2 2 -6+ Figure for 4 2 P(3, 4) Q 6 X

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a The slope of the line joining P34 and O00 is m y2 y1x2 x1 0 40 3 43 b To find the equation of the ... View full answer

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