Turn on thread page Beta
    • Thread Starter

    Assuming I have point (x, y) and line y=mx, I can find the shortest ppd distance between (x,y) and mx by creating a new line through (x,y) using the gradient -(1/m)

    Is there a simple equation that tells me the x-coordinate of the intercept between these two lines?

    Thank you

    You would use the reciprocal of the gradient of the line -1/m as you said. For your given point (x,y), create a new equation with gradient -1/m, and then solve simultaneously to give a point of intersection. Once you have the point, use Pythagoras to find the distance
    Not really sure if that answers the question, but that's the method I've always used and haven't come across anything simpler
Submit reply
Turn on thread page Beta
Updated: March 13, 2016

University open days

  1. University of Bradford
    University-wide Postgraduate
    Wed, 25 Jul '18
  2. University of Buckingham
    Psychology Taster Tutorial Undergraduate
    Wed, 25 Jul '18
  3. Bournemouth University
    Clearing Campus Visit Undergraduate
    Wed, 1 Aug '18
How are you feeling in the run-up to Results Day 2018?
Useful resources

Make your revision easier


Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here


How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.