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Which equation does not represent the graph of a function?

Answer and explanation

Correct answer: (x=y^2)

The direct answer is option A: x=y^2 does not represent y as a function of x. For example, x=4 gives y^2=4, so y=2 or y=-2. One input x therefore has two outputs, violating the definition of a function. Equivalently, a vertical line such as x=4 cuts the graph twice, so the vertical-line test fails. Option A is correct. Option B, y=x^2, gives exactly one y for every x. Option C, y=|x|, also gives one output for each x. Option D, y=\sqrt{x}, is defined for x\ge0 and has one non-negative output. Common mistake: confusing the vertical-line test with the horizontal-line test.

Related tags

Standard-FunctionsVertical-Line-TestSideways-Parabola

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