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If the line (y=-(p+5)x+24) decreases (y) by (72) when (x) increases by (6), what is (p)?

Answer and explanation

Correct answer: 7

The slope of the line is \(-(p+5)\). A decrease of \(72\) in \(y\) for an increase of \(6\) in \(x\) gives slope \(\frac{-72}{6}=-12\). Therefore, \(-(p+5)=-12\), so \(p+5=12\) and \(p=7\). If \(p=8\), the slope would be \(-13\), giving a decrease of \(78\) for an increase of 6 in \(x\). Exam tip: In change-based questions, first find the slope using \(\frac{\Delta y}{\Delta x}\).

Related tags

SlopeLinear EquationsCoordinate GeometryParameterRate Of ChangeSlope And Y InterceptIntroduction To PolynomialsMathematics

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