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Two parallel planes 2x + 2y + z = 3 and 2x + 2y + z = 9 are how far apart?
A6 units
B2 units
C3 units
D1 unit
Answer & Solution
Correct answer: B. 2 units
The gap in constants is 6 and the normal length is 3, so the distance is 6/3 = 2.
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