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In the line \(y=-\frac{9}{5}x+22\), how much should (x) increase to decrease (y) by (54)?

Answer and explanation

Correct answer: 30

The slope is \(-\frac{9}{5}\), so for every increase of 5 units in \(x\), \(y\) decreases by 9 units. For a decrease of 54 in \(y\), \(\frac{9}{5}\Delta x=54\). Hence, \(\Delta x=54\times\frac{5}{9}=30\). If 35 were chosen, \(y\) would decrease by \(63\), not 54. Exam tip: in change-based questions, the constant 22 does not affect the change; use only the slope and \(\Delta x\).

Related tags

Linear EquationsSlopeChange In VariablesCoordinate GeometryRate Of ChangeSlope And Y InterceptIntroduction To PolynomialsMathematics

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