Show that the path of a moving point such that its distances from two lines $3x - 2y = 5$ and $3x + 2y = 5$ are equal is a straight line.

Vedclass pdf generator app on play store
Vedclass iOS app on app store
(N/A) Given lines are $3x - 2y - 5 = 0$ $(1)$ and $3x + 2y - 5 = 0$ $(2)$.
Let $(h, k)$ be any point whose distances from lines $(1)$ and $(2)$ are equal.
The distance of $(h, k)$ from line $(1)$ is $\frac{|3h - 2k - 5|}{\sqrt{3^2 + (-2)^2}} = \frac{|3h - 2k - 5|}{\sqrt{13}}$.
The distance of $(h, k)$ from line $(2)$ is $\frac{|3h + 2k - 5|}{\sqrt{3^2 + 2^2}} = \frac{|3h + 2k - 5|}{\sqrt{13}}$.
Since the distances are equal,we have $\frac{|3h - 2k - 5|}{\sqrt{13}} = \frac{|3h + 2k - 5|}{\sqrt{13}}$,which implies $|3h - 2k - 5| = |3h + 2k - 5|$.
This gives two cases:
Case $1$: $3h - 2k - 5 = 3h + 2k - 5 \implies -2k = 2k \implies 4k = 0 \implies k = 0$.
Case $2$: $3h - 2k - 5 = -(3h + 2k - 5) \implies 3h - 2k - 5 = -3h - 2k + 5 \implies 6h = 10 \implies h = \frac{5}{3}$.
Thus,the locus of the point $(h, k)$ is $y = 0$ or $x = \frac{5}{3}$,both of which represent straight lines.

Explore More

Similar Questions

Let $A$ be a fixed point $(0,6)$ and $B$ be a moving point $(2t, 0)$. Let $M$ be the mid-point of $AB$ and the perpendicular bisector of $AB$ meets the $y$-axis at $C$. The locus of the mid-point $P$ of $MC$ is:

Let $A(5, -3)$,$B(3, -2)$,and $C(-1, 5)$ be three points. If $P$ is a point satisfying the condition $PA^2 + 2PB^2 = 3PC^2$,then a point that lies on the locus of $P$ is

If $P = (1, 0)$,$Q = (-1, 0)$,and $R = (2, 0)$ are three given points,then the locus of the points $S$ satisfying the relation $SQ^2 + SR^2 = 2 SP^2$ is :

If $A = (a, 0)$ and $B = (-a, 0)$,then the locus of a point $P = (x, y)$ such that $PA^2 - PB^2 = a^2$ is.

The Cartesian form of the polar equation $\theta = \tan^{-1} 2$ is

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo