C / C++ graphing & Plotting

["sotl155360 earthlink net" <sotl155360 earthlink net>]

First I am very new to C/CPP consequently I would appreciate a little
help.

I am trying to graph on screen in c or cpp a number of simple
mathematical functions of the form:

y = K and X = K for axes

Along with

y = K1 x + K2

y = K/x

y = K1 (x**n) +K2

In the range of 0 to 1 where x, and y are variables and n, K1, and K2
are constants.

These functions are to be used to display events and progress in a much
longer and complex C program.

Would you know of an online tutorial / book that can coach me through
these types of simple graphic presentations.

Thanks

Frank