How to use
The coordinates of the points (x0,y0) and (x1,y1) can be determined in either of two ways: To reset the points to default settings, click the "Clear" button.
 "Natural" Exponential: (x0,y0)=(0,1), (x1,y1)=(1,e)

 Base 2 Exponential: (x0,y0)=(0,1), (x1,y1)=(1,2)

 Exponential Decay: (x0,y0)=(-1,2), (x1,y1)=(0,1)

 No Solution Curve: (x0,y0)=(0,1), (x1,y1)=(1,-1)

Other Notes
The initial settings for the two points give the "natural" exponential function y=ex, with (x0,y0)=(0,1) and (x1,y1)=(1,e).
If the two points (x0,y0) and (x1,y1) are on opposite sides of the x-axis (as in the "No Solution Curve" example above), then there are no valid solutions for C and k in the equation y=Cekx.