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If the line (y=-(p+3)x+18) decreases (y) by (36) when (x) increases by (4), what is (p)?

Answer and explanation

Correct answer: 6

The slope of the line is \( -(p+3) \). When \(x\) increases by 4, the change in \(y\) is \(4[-(p+3)]\). Since \(y\) decreases by 36, \(4[-(p+3)]=-36\). Thus, \(p+3=9\), so \(p=6\). If \(p=5\), the slope would be \(-8\), giving a decrease of only 32. Exam tip: for a linear equation, use \(\Delta y=m\Delta x\) to find changes quickly.

Related tags

Slope Of A LineY-InterceptLinear EquationsRate Of ChangeParametersSlope And Y InterceptIntroduction To PolynomialsMathematics

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