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Question: Answered & Verified by Expert
The image of the line x2=y-15=z+13 in the plane x+y+2z=3 meets the xz-plane at the point a,b,c, then the value of c is equal to
MathematicsThree Dimensional GeometryJEE Main
Options:
  • A 116
  • B 1296
  • C 1156
  • D 2323
Solution:
1113 Upvotes Verified Answer
The correct answer is: 1296

Any general point on the line is 2λ,5λ+1,3λ-1

On satisfying this point on the plane, we get, 
2λ+5λ+1+6λ-2=3
13λ=4λ=413
So, coordinates of the point are 813,3313,-113
This point also lies on the image of the line
Image of point 0,1,-1 also lies on the image of the line
x-01=y-11=z+12=-2-46
x=43,y=73,z=53
Point is 43,73,53
Equation of image of the line is x-4328=y-73-8=z-5368
For xz-plane, putting y=0, we get, 

x-4328=724=z-5368
z=1296

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