1. The problem statement, all variables and given/known data Plot a suitable graph, using your x and y data, to find the variables a and b. 2. Relevant equations y = ax + bx^2 3. The attempt at a solution This is clearly a quadratic, the best I can do is to play about with lns and I came out with lny = lnax + lnbx^2 lny = ln(ab.x^3) lny = 3ln(ab) + 3lnx so plotting lny against lnx should give gradient 3 and from the intercept can get the product ab but not the individual values of a and b. Other than taking two point from the graph and using simulataneous equations is there something I'm missing? Is there another graphical way to get at a and b?