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If (y=170-10x), what is the difference between (y) at (x=4) and (y) at (x=11)?

Answer and explanation

Correct answer: 70

Putting x=4 gives y=170-10(4)=130. Putting x=11 gives y=170-10(11)=60. Therefore, the difference between the two y-values is 130-60=70. Note that 60 is the value of y at x=11, not the difference. Exam tip: For a linear expression, substitute both x-values first and then subtract the resulting y-values.

Related tags

Linear EquationsLinear DecayPolynomialsValue SubstitutionDifference Of ValuesLinear Growth And DecayIntroduction To PolynomialsMathematics

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