How to determine Scale of Line Graph based on Pixels/Height?

You are using a*x^2 + b*x + c ( quadratic equation ). You will get list of (X,Y) values inserted by user. Let us say 5 points you get are (1,1) (2,4) (4,1) (5,6) (6,7).

What I did was to determine how many points I had going in the x and y directions, and then divide that by the x and y dimensions, then divide that by 3, as I wanted each minimum point to be three pixels, so it could be seen.

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