AP EAMCET · Maths · Three Dimensional Geometry
If the line joining the points \(A(2,3,-1)\) and \(B(3,5,-3)\) is perpendicular to the line joining \(C(1,2,3)\) and \(D(3, y, 7)\), then \(y=\)
- A 1
- B 3
- C 5
- D 7
Answer & Solution
Correct Answer
(C) 5
Step-by-step Solution
Detailed explanation
\[ \begin{aligned} & \text {Given, } A=(2,3-1) \\ & \qquad B=(3,5-3) \\ & \text { DR's of } \mathbf{A B}=(3-2,5-3,-3+1)=(1,2,-2) \\ & \text { and } C=(1,2,3) \\ & \qquad D=(3, y, 7) \end{aligned} \]…
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