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Example

Graphing y=x2y = x^2 by Plotting Points

To graph the quadratic equation y=x2y = x^2, choose integer values for xx (such as 2-2, 1-1, 00, 11, and 22) and substitute them into the equation to find their corresponding yy values. This yields the ordered pairs (2,4)(-2, 4), (1,1)(-1, 1), (0,0)(0, 0), (1,1)(1, 1), and (2,4)(2, 4). Because squaring a number and its opposite produces the same result (for example, 12=11^2 = 1 and (1)2=1(-1)^2 = 1), the yy values are symmetrical. Plotting these points and connecting them forms an upward-opening parabola.

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Updated 2026-05-01

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