Originally Posted by

**kcsteven** I am asked to sketch the graph of this equation using my TI-84 Plus calculator, changing from parametric to function mode to solve the equation X^2 + Y^2 = 4, for Y as a function of X. Given are y1 = +sqrt(?) and y2 = -sqrt(?)

I must be doing something wrong because when I solve the equation for y as a function of X, I come up with Y = Sqrt(4-x^2) and this gives me a syntax error on the calculator, so I know what I have done is wrong. Would someone please explain the error of my ways.

Thank You,

Keith Stevens