A plane intercepts the coordinate axes at , , and such that the centroid of the triangle formed by these intercepts is . What is the equation of the plane?

Answer and explanation

Correct answer: A.

  1. Step 1: The centroid of the triangle with vertices , , and is .
  2. Step 2: Equating coordinates to : , , and .
  3. Step 3: Write the intercept form of the plane: .
Answer
.
Why not the others: uses the centroid coordinates directly as intercepts; is the plane perpendicular to the centroid vector; inverts the intercept sequence.

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