Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta
    • Thread Starter

    Need help with this please7.
    It is believed that two quantities, x and y, are connected by a relationship of the form n y = kx , where k and n are constants.
    In an experiment, the following data were produced.
    x 5 10 15 20 25 30 35
    y 9 24 48 69 102 131 166
    (i) Explain how the form of the relationship can be tested by plotting log
    y against log x. [2]
    (ii) Make out a table of values of log x and log y and plot the graph. [3]
    (iii) Use your graph to estimate the values of k and n. [3]
    •  Official Rep

     Official Rep
    Sorry you've not had any responses about this.

    Why not try posting in a specific subject forum- you might have more luck there.

    Here's a link to our subject forum which should help get you more responses.


    That is some hard ****.

    Moved to maths.

    Edit to add: I swear I've answered this on another thread. :erm:

    You ahould be familiar with plotting a scattergraph, drawing a line of best fit to match the data and deriving its equation. (y = mx + c)

    If you plot this experimental data on a scattergraph you may be able to spot a nonlinear relationship (such as a curve). But deriving the relationship of such a curve will be tricky.

    By taking the logs of each variable and plotting logx against logy this will turn an exponential relationship into a linear one on a graph.

    By deriving a line of best fit here and expressing it as "logy = mlogx + c" you should be able to determine the relationship.
How are you feeling about your exams?
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.