Exponential modeling problem

Hi, I"m having trouble working out this problem.

Using data provided, develop a model in the form to state the relationship between mass, m, and the length, l, of the fish.

Here is the data:

l 10.1 25.0 32.6 35.4 43.8 45.5 55.7

m 51 236 520 660 1250 1425 2590

I tried doing this with simultaneous equations, using two sets of data points, but that just didn't work. Does anyone know how one would do this?

David.

OK I have the linear regression

So I have found that the y intercept of the graph is my and that the gradient will give me my k.

But I have the y axis as unit increments, 1, 2, 3 and the x axis as 5 unit increments, 5, 10, 15, etc

If I take to vertical lines say from 15 and 20 up to my regression line and then draw across to get their corresponding y-axis values, can I use the gradient formula to get the correct gradient. what I"m asking is the fact that I have used different increments for the y and x axis going to affect me using the gradient formula.

David.