If the straight line \frac{x-x_0}{ℓ}=\frac{y-y_0}{m}=\frac{z-z_0}{n} is parallel to the plane a x+b y+c z+d=0 then which one of the following is correct?

Correct Answer is : aℓ+bm+cn=0

\frac{a}{ℓ}+\frac{b}{m}+\frac{c}{n}=0

UPSC NDA I 2013 Mathematics Paper

Question : 30 of 120

Marks: +1, -0

If the straight line ‌

x−x0

ℓ

=‌

y−y0

=‌

z−z0

is parallel to the plane ax+by+cz+d=0 then which one of the following is correct?

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