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If the line (y=-(p+1)x+12) decreases (y) by (15) when (x) increases by (3), what is (p)?

Answer and explanation

Correct answer: 4

The slope of the line is \(-(p+1)\). Since an increase of 3 in \(x\) causes a decrease of 15 in \(y\), the slope is \(\frac{-15}{3}=-5\). Therefore, \(-(p+1)=-5\), so \(p+1=5\) and \(p=4\). Option 5 would result from incorrectly taking \(p+1\) as the answer. Exam tip: for change-based questions, find the slope using \(\frac{\Delta y}{\Delta x}\).

Related tags

SlopeLinear EquationsParameterCoordinate GeometryY-InterceptSlope And Y InterceptIntroduction To PolynomialsMathematics

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