If the lines frac{x-1}{2}=frac{y+1}{3}=frac{z | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The given lines are $L_1: \frac{x-1}{2}=\frac{y+1}{3}=\frac{z-1}{4}$ and $L_2: \frac{x-3}{1}=\frac{y-k}{2}=\frac{z-0}{1}$.For two lines to interse

Vedclass · Accepted Answer

$\frac{9}{2}$

Vedclass · Answer

(D) The given lines are $L_1: \frac{x-1}{2}=\frac{y+1}{3}=\frac{z-1}{4}$ and $L_2: \frac{x-3}{1}=\frac{y-k}{2}=\frac{z-0}{1}$.For two lines to intersect,the shortest distance between them must be $0$.This implies the determinant of the matrix formed by the difference of points and direction vectors must be $0$.$\begin{vmatrix} x_2-x_1 & y_2-y_1 & z_2-z_1 \ a_1 & b_1 & c_1 \ a_2 & b_2 & c_2 \end{vmatrix} = 0$Substituting the values $(x_1, y_1, z_1) = (1, -1, 1)$,$(x_2, y_2, z_2) = (3, k, 0)$,$(a_1, b_1, c_1) = (2, 3, 4)$,and $(a_2, b_2, c_2) = (1, 2, 1)$:$\begin{vmatrix} 3-1 & k-(-1) & 0-1 \ 2 & 3 & 4 \ 1 & 2 & 1 \end{vmatrix} = 0$$\begin{vmatrix} 2 & k+1 & -1 \ 2 & 3 & 4 \ 1 & 2 & 1 \end{vmatrix} = 0$Expanding the determinant along the first row:$2(3(1) - 4(2)) - (k+1)(2(1) - 4(1)) - 1(2(2) - 3(1)) = 0$$2(3-8) - (k+1)(2-4) - 1(4-3) = 0$$2(-5) - (k+1)(-2) - 1(1) = 0$$-10 + 2k + 2 - 1 = 0$$2k - 9 = 0$$k = \frac{9}{2}$

If the lines $\frac{x-1}{2}=\frac{y+1}{3}=\frac{z-1}{4}$ and $x-3=\frac{y-k}{2}=z$ intersect,then the value of $k$ is

Similar Questions

The sum of the coordinates of one of the points on the line $\frac{x - 2}{1} = \frac{y + 3}{-2} = \frac{z + 5}{2}$ which is at a distance of $3 \text{ units}$ from the point $(2, -3, -5)$ is

$P, Q, R$ and $S$ are four points with the position vectors $3i-4j+5k, 0i+0j+4k, -4i+5j+1k$ and $-3i+4j+3k$,respectively. Then,the line $PQ$ meets the line $RS$ at the point

The vector equation of a line whose Cartesian equations are $y=2$ and $4x-3z+5=0$ is

$\triangle ABC$ is formed by $A(1, 8, 4)$,$B(0, -11, 4)$ and $C(2, -3, 1)$. If $D$ is the foot of the perpendicular from $A$ to $BC$,then the coordinates of $D$ are

The Cartesian equation of a line is $\frac{x-5}{3}=\frac{y+4}{7}=\frac{6-z}{2}$. Find the vector equation of the line.

Vedclass Test Series

Exam Paper Generator

Online Exam Module