# Linear law problem

• Feb 4th 2013, 12:03 AM
haoguang
Linear law problem
The diagram shows part of a straight line obtained by plotting log10 y against log10 x for two variables x and y. Find
a) log10 y in terms of log10 x
b) y in terms of x
c) the valve of x when y = 40

Can teach me how to do??Attachment 26843
• Feb 4th 2013, 07:24 AM
topsquark
Re: Linear law problem
How far have you gotten on this?

Hint: The "log(y) and log(x)" act as y and x values. So your line on the graph will be of the form:
$log_{10}(y) = m \cdot \log_{10}(x) + b$, where m and b are the usual slope of the line, and b is the y-intercept.

-Dan