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Which equation represents a line perpendicular to \(y=-3x+7\) and having the same \(y\)-intercept?

Answer and explanation

Correct answer: \(y=\frac{1}{3}x+7\)

The given line has slope \(-3\) and y-intercept \(7\). For perpendicular non-vertical lines, the product of slopes is \(-1\), so the required slope is \(\frac{1}{3}\). Keeping intercept \(7\) gives option A. Option B is parallel, not perpendicular. Exam tip: in \(y=mx+c\), \(c\) is the y-intercept.

Related tags

SlopeY-InterceptPerpendicular LinesCoordinate GeometryLinear EquationsSlope And Y InterceptIntroduction To PolynomialsMathematics

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