83Plus:Basic:Graphics:DrawInv
From WikiTI
DrawInv draws the function as if the Y and X vaules were switched.
Try this on the homescreen or a program. DrawInv("X^2")
You should see a parabola starting at (0,0) moving off to the right.
Also you can use equations instead of strings. Put an equation in Y1 DrawInv(Y1)
You can access the equation variables by hitting [Vars] and scrolling to functions.