Not every equation naturally gives rise to a straight line. If we have variablesandrelated byorandrelated bythen graphs ofagainstoragainst will not result in a straight line. We are however not restricted to plotagainstor againstWe can often rearrange an equation into a form which will give a straight line if we plot a suitable function of one variable against a suitable function of the other. In order to do this we need to:

For the equationabove, taking natural logs results in a straight line.

For the equationabove, plottingagainstresults in a straight line with gradient -1 andinterceptsince