In Exercises 13 and 14(a), three points A, B, and C are specified. Determine whether A, B, and C are collinear (lie on the same line) by checking to see whether the slope of equals the slope
(b) If the area of the “triangle” formed by three points is zero, then the points must in fact be collinear. Use this observation, along with the formula in Exercise 14(b) of Exercise Set 1.4, to rework part (a).
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