text: how to graph the function of y^2=x(ysquare) on a ti-86 calculator? how can we graph a function with respect to y on a graphing calculator: ie. x=y^2+2y 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.)  you 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  y = square root of x and y = - square root of x  as 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.