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If in (y=300-bx), (y) decreases by (120) from (x=6) to (x=14), what is (b)?

Answer and explanation

Correct answer: \(15\)

The change in \(x\) is \(14-6=8\). In \(y=300-bx\), every increase of 1 unit in \(x\) decreases \(y\) by \(b\) units. Therefore, the total decrease is \(8b\). Given \(8b=120\), we get \(b=120/8=15\). If \(b=14\), the decrease would be \(8\times14=112\), not 120. Exam tip: For a linear relation, total change equals rate of change times the change in input.

Related tags

Linear EquationsLinear DecayRate Of ChangePolynomialsAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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