text: X = Y^2 is not a function. It fails the vertical line test. You cannot graph it on a graphing calculator. (At least not a TI-86.)\n\nYou need to break it into two pieces that don't have multiple y values per x value. In this case, x = y^2 breaks nicely into \ny = square root of x\nand y = - square root of x\n\nAs far as I know, you can't graph X as a function to Y on any TI graphing calculators, but I only know up to the TI-89. You can simulate a graph of a f(y) = x equation but you have to convert it into a piecewise function.