simple example of using scratch to plot a parabola using the quadratic form of a(x)^2 + b(x) + c where y is a function of x. Use the sliders for aInteger and aDecimal to adjust the value of a. (the parabola is interesting to look at for values of a between 1 and -1 so a is a combination of aInteger + aDecimal). Hit the space bar to plot the parabola again after you've changed the values of a, b or c. Probably best to run this in turbo mode (shift-click green flag) unless you want to watch the pencil march across the screen slowly.
