Graph the parent function
Consider the function f(x) = 1/x.
Drag the points located in the box to the axes. Plot the points (-0.1, -10) , (0.1, 10) , (10, 0.1) and (-10, -0.1) that we have evaluated.
Evaluate the function for any other values of x that you may need.
The points will turn green when they are a sufficiently accurate approximation to the curve. When all the points turn green the function f(x) will appear.