Linear equations can be shown on a graph. Find out how to create one in this Bitesize KS3 maths video.

You probably use VLOOKUP() function to find exact matches in Microsoft Excel, but you can also find the closest value when you don't know the exact value.

You could use a computer to fit an exponential function to the data and measure how well it fits. But how about just turning an exponential function into a linear function?