3D Geometry
Plane through line at minimum distance from point
MMTS_Full_Test_19
Grade 12

Question:

Equation of plane containing the line $\dfrac{x-1}{2}=\dfrac{y-2}{3}=\dfrac{z-3}{4}$ at minimum possible distance from $(-1,-3,1)$ is
(A) $7x-2y-2z+3=0$
(B) $x+3y+10=0$
(C) $3x+y-z=2$
(D) none of these

Step-by-Step Solution

Key Concept: Plane through line: $a(x-1)+b(y-2)+c(z-3)=0$ with $2a+3b+4c=0$. Point $(-1,-3,1)$ on line: confirm it's not on the line ($x=1+2t=-1\Rightarrow t=-1$; $y=2-3=−1\neq-3$). Distance from $(-1,-3,1)$ to plane min when the vector from the point on line to $(-1,-3,1)$ is perpendicular to plane's direction in the constraint surface.
$7x-2y-2z+3=0$.
Correct Answer: (A) $7x-2y-2z+3=0$

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