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Which graph will fail the vertical line test?

Answer and explanation

Correct answer: \(x^2+y^2=4\)

The vertical line test determines whether a curve represents a function of \(x\): every vertical line must intersect the graph at no more than one point. For the circle \(x^2+y^2=4\), solving for \(y\) gives \(y=\pm\sqrt{4-x^2}\). For example, when \(x=0\), the graph contains both \((0,2)\) and \((0,-2)\), so the vertical line \(x=0\) intersects it twice. Hence the circle fails the test and is not the graph of a single-valued function \(y=f(x)\). The parabolas or absolute-value and square-root graphs in the other options give at most one \(y\)-value for each permitted \(x\), so option C is correct.

Related tags

Vertical-Line-TestGraphs-Of-FunctionsCircleGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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