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Joint Entrance Examination
Mathematics
3D Geometry
Question 475
Question 475 of 521
Medium
MCQ
Consider the three planes P1 : 3x + 15y + 21z = 9, P2 : x - 3y - z = 5, and P3 : 2x + 10y + 14z = 5 Then, which one of the following is true?
A
P1 and P2 are parallel.
B
P1, P2 and P3 all are parallel.
C
P1 and P3 are parallel.
D
P2 and P3 are parallel.
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Official solution
P1 : 3x + 15y + 21z = 9, P2 : x - 3y - z = 5 P3 : x + 5y + 7z = 5/2 \[ \therefore \] P1 and P3 are parallel.
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