Q116 / 180 · KCET 2024 · Mathematics
The plane containing the point $(3,2,0)$ and the line $\frac{x-3}{1}=\frac{y-6}{5}=\frac{z-4}{4}$ is
- Correct answerA$x-y+z=1$
- B$x+y+z=5$
- C$x+2 y-z=1$
- D$2 x-y+z=5$
Solution
Given that point $(3,2,0)$ lies on plane and line $\frac{x-3}{1}=\frac{y-6}{5}=\frac{z-4}{4}$ also lies on the plane.
$\because$ Plane contains points $(3,2,0)$ and $(3,6,4)$
The DR's of line joining these two points is $(0,4,4)$.
Therefore, DR's of normal to plane is
$(\hat{\mathbf{i}}+5 \hat{\mathbf{j}}+4 \hat{\mathbf{k}}) \times(4 \hat{\mathbf{j}}+4 \hat{\mathbf{k}})=4 \hat{\mathbf{i}}-4 \hat{\mathbf{j}}+4 \hat{\mathbf{k}}$
Therefore, the equation of plane is
$4 x-4 y+4 z=k$
$\because$ Point $(3,2,0)$ lies on planes. So, we get
$\therefore \quad k=4 \times 3-4 \times 2+4 \times 0=4$
Hence, the equation of plane is $x-y+z=1$.
Hence, the correct answer is option: 'A'.