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If \(y=95-5x\) and \(x\) changes from \(4\) to \(11\), what is the total decrease in \(y\)?

Answer and explanation

Correct answer: \(35\)

The change in \(x\) is \(11-4=7\). The coefficient of \(x\) is \(-5\), so for every increase of 1 in \(x\), \(y\) decreases by 5. Hence, the total decrease in \(y\) is \(5\times 7=35\). Equivalently, \(y(4)=75\) and \(y(11)=40\), so the decrease is \(75-40=35\). Exam tip: multiply the magnitude of the coefficient by the change in the variable to find total decrease.

Related tags

Linear EquationsPolynomialsRate Of ChangeLinear DecaySubstitutionLinear Growth And DecayIntroduction To PolynomialsMathematics

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