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Find the ratio in which the point P(-1, y) lying on the line segment joining A(-3, 10) and B(6, -8) divides it. Also find the value of y. |
Answer» Let P divide A(-3, 10) and B(6, -8) in the ratio of k: 1 Given coordinates of P as (-1, y) Now, using the section formula for x – coordinate we have -1 = 6k – 3/ k + 1 -(k + 1) = 6k – 3 7k = 2 k = 2/7 Thus, the point P divides AB in the ratio of 2: 7 Using value of k, to find the y-coordinate we have y = (-8k + 10)/ (k + 1) y = (-8(2/7) + 10)/ (2/7 + 1) y = -16 + 70/ 2 + 7 = 54/9 y = 6 Therefore, the y-coordinate of P is 6 |
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