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Which of the following equations represents a straight line with an undefined slope?

Answer and explanation

Correct answer: \(x=4\)

\(x=4\) is a vertical line. Its change in \(x\) is zero, so the slope \(\Delta y/\Delta x\) is undefined. Exam tip: any line of the form \(x=\text{constant}\) has an undefined slope.

Related tags

SlopeUndefined SlopeVertical LineCoordinate GeometryLinear EquationsSlope And Y InterceptIntroduction To PolynomialsMathematics

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