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Which of the following equations represents a line perpendicular to \(y=2x-1\) and intersecting the \(y\)-axis at \(3\)?

Answer and explanation

Correct answer: \(y=-\frac{1}{2}x+3\)

The given line has slope \(2\). For perpendicular lines, the product of slopes is \(-1\), so the required slope is \(-\frac{1}{2}\). With y-intercept \(3\), the equation is \(y=-\frac{1}{2}x+3\). Option D has the correct slope but intercept \(-3\). Exam tip: check \(m\) and \(c\) separately in \(y=mx+c\).

Related tags

SlopeY-InterceptPerpendicular LinesLinear EquationsCoordinate GeometryClass 9 MathematicsSlope And Y InterceptIntroduction To Polynomials

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