This is really simple for your average person but not me.

Basically I have a dataset involving production of x amount of units and y total costs.

I want to be able to draw a graph, produce an equation and plot the line of best fit on the graph.

How do I find the equation for y on x?

9, 157

11, 215

14, 319

15, 358

16, 400

20, 592

21, 645

25, 885

32, 1397

38, 1929

As you can tell this will produce a curvilinear graph, and from what I've determined from using a calculator, A = 18.087, B=4.66, C=1.200, although it obviously doesn't because the equation won't work.