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Question: Answered & Verified by Expert
The line $\frac{x-2}{3}=\frac{y-3}{4}=\frac{z-4}{5}$ is parallel to the plane
MathematicsThree Dimensional GeometryCOMEDKCOMEDK 2021
Options:
  • A $3 x+4 y+5 z=7$
  • B $2 x+3 y+4 z=0$
  • C $x+y-z=2$
  • D $2 x+y-2 z=0$
Solution:
2740 Upvotes Verified Answer
The correct answer is: $2 x+y-2 z=0$
We know that, any line is parallel to the plane, then normal to the plane is perpendicular to the line.
Given, line is $\frac{x-2}{3}=\frac{y-3}{4}=\frac{z-4}{5}$
So, DR's of line are $\langle 3,4,5\rangle$.
Let us consider the equation of plane be $2 x+y-2 z=0$ [from the given options]
Hence, DR's of a plane are $\langle 2,1,-2\rangle$.
Now, $3 \times 2+4 \times 1+5 \times(-2)=6+4-10$
$$
=10-10=0
$$
Option (d) is correct.

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