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If (y=130-8x), what is the difference between (y) at (x=3) and (y) at (x=10)?

Answer and explanation

Correct answer: 56

At \(x=3\), \(y=130-8(3)=106\). At \(x=10\), \(y=130-8(10)=50\). Therefore, the difference between the two \(y\)-values is \(106-50=56\). Choosing 48 would result from using an incorrect change in \(x\) instead of the actual difference, \(10-3=7\). Exam tip: for a linear expression, calculate both values of \(y\) and subtract them to find the difference reliably.

Related tags

Linear EquationLinear DecayRate Of ChangeSubstitutionAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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