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The planes: 2x − y + 4z = 5 and 5x − 2.5y + 10z = 6 are

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The planes: 2x − y + 4z = 5 and 5x − 2.5y + 10z = 6 are

(A) Perpendicular      (B) Parallel    (C) intersect y-axis         (D) passes through (0,0,5/4)
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Best answer

The equations of the planes are
2x − y + 4z = 5 … (1)
5x − 2.5y + 10z = 6 … (2)
It can be seen that,

Therefore, the given planes are parallel.
Hence, the correct answer is B.

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