How would you do this maths question? Watch

choondy1
Badges: 3
Rep:
?
#1
Report Thread starter 2 years ago
#1
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
0
reply
Cryptokyo
Badges: 14
Rep:
?
#2
Report 2 years ago
#2
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
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • University of the West of England, Bristol
    Undergraduate Open Afternoon - Frenchay Campus Undergraduate
    Wed, 23 Jan '19
  • University of East London
    Postgraduate Open Evening Postgraduate
    Wed, 23 Jan '19
  • University of Gloucestershire
    School of Education Open Day Postgraduate
    Wed, 23 Jan '19

Brexit: Given the chance now, would you vote leave or remain?

Remain (1648)
78.78%
Leave (444)
21.22%

Watched Threads

View All