Let l be the line through the points P and Q in Fig. 7.(a) If P = (2, 4) and Q = (5, 13),...

Let l be the line through the points P and Q in Fig. 7.

(a) If P = (2, 4) and Q = (5, 13), find the slope of the line l and the length of the line segment d.

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(b) As the point Q moves toward P, does the slope of the line l increase or decrease?

Figure 7 The slope of a secant line.