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If in (y=160-bx), (y) decreases by (45) from (x=3) to (x=8), what is (b)?

Answer and explanation

Correct answer: \(9\)

The change in \(x\) is \(8-3=5\). In \(y=160-bx\), \(y\) decreases by \(b\) units for every 1-unit increase in \(x\). Hence, the total decrease is \(5b\). Given \(5b=45\), we get \(b=45/5=9\). Therefore, \(9\) is correct. If \(b=15\), the decrease would be \(5\times15=75\), not 45. Exam tip: For a linear relation, total change equals rate per unit times the change in the variable.

Related tags

Linear EquationsLinear DecayRate Of ChangePolynomialsAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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