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Question

Write the ratio in which YZ-plane divides the segment joining P (−2, 5, 9) and Q (3, −2, 4).

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Solution

Let the YZ-plane divide the line segment joining points P-2, 5, 9 and Q 3, -2, 4 in the ratio k:1.Using the section formula, the coordinates of the point of intersection are given byk3-2k+1, k-2+5k+1, k4+9k+1On the YZ-plane, the X-coordinate of any point is zero. k3-2k+1=03k-2=0k=23Thus, the YZ-plane divides the line segment formed by joining the given points in the ratio 2:3 internally.

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