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If the x-coordinate of a point `P` on the jon of `Q(2,2,1)` and `R(5,1,-2)` is 4, then its z-coordinate isA. `-2`B. `-1`C. 1D. 2 |
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Answer» Correct Answer - B Suppose P divides QR in the ratio `lambda : 1` . Then coordinates of P are `((5lambda+2lambda)/(lambda+1),(2lambda +2)/(lambda +1),(-2lambda +1)/(lambda +1))` Since, the coordinate of P is 4. i.e., `(5lambda + 2)/(lambda +1) =4 rArr lambda = 2` So , Z- coordinate of P is `(-2lambda +1)/(lambda+1) = (-4 +1)/(2+1) = - 1` |
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