Derive a non linear function between two points

Question

I have to figure out a non linear function for these two data sets. The only input values i have is Start Y, End Y, Start X and End X

Here is both the functions in geogebra.

Function1 StartX = 1, StartY = 1000, EndX = 200, EndY = 100000

Function2 StartX = 1, StartY = 500, EndX = 200, EndY = 50000

Text Version

Answer 1

Figured out the problem here, more can be seen in the discussion of the first thread but I had my variables wrong