You can't graph an equation (other than a linear equation) exactly without plotting individual points.
You can get a pretty good approximation by noting that, since x2 is always positive, y= 9/x2 is above the y axis and symmetric about the x axis. Of course, for x close to 0, y will be very large: the y axis is a vertical asymptote. For x very large, y is close to 0: the x axis is a horizontal asymptote.
(2) If you replace x with y and y with x, can you reflect the equation 9/x^2 ?
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