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      Question

      Determine the value of k such that the points A(2,3),

      B(4,k), and C(6,-3) lie on the same straight line.
      B 1 Correct Answer Incorrect Answer
      C 2 Correct Answer Incorrect Answer
      D 3 Correct Answer Incorrect Answer

      Solution

      Since the points A, B, and C are collinear, the slope of line segment A(2, 3) to B(4, k) is the equal to the slope of the line segment from A(2, 3) to C(6, -3).

      To calculate slope, the formula is (y2 - y1)/(x2 - x1).

      => (k - 3)/(4 - 2) = (-3 - 3)/(6 - 2)

      => (k - 3)/2 = -6/4

      => (k - 3) = -3

      => k = 0

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