Join TSR now and get all your revision questions answeredSign up now

How would you do this maths question?

    • Thread Starter

    The variables x and y and the constants a and b are real and positive. The variables x and y are related.

    A graph of log y against log x is drawn.

    For which one of the following relationships will this graph be a straight line?

    1) y^6=a^x
    2) y=ab^x
    3) y^2=a + x^b
    4) y=ax^b
    5) y^x=a^b

    Thanks a lot

    Make log(y) the subject by taking the log of both sides.

    So for a it would be 6\log(y)=x\log(a) and this is not of the form \log(y)=m\log(x)+c so the answer is not a.

    Do this for the rest and see which are of the form \log(y)=m\log(x)+c
Do you have exam superstitions?
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

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