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In the line \(y=\frac{5}{4}x-9\), how much should (x) increase to increase (y) by (25)?

Answer and explanation

Correct answer: 20

The slope is \(\frac{5}{4}\), so an increase of 4 units in \(x\) increases \(y\) by 5 units. Thus, \(\Delta y=\frac{5}{4}\Delta x\). Putting \(\Delta y=25\), we get \(25=\frac{5}{4}\Delta x\), hence \(\Delta x=25\times\frac{4}{5}=20\). Option 25 is the required change in \(y\), not the change in \(x\). Exam tip: for change-based questions on a line, use the slope; the constant term \(-9\) does not affect the change.

Related tags

Linear EquationsSlopeChange In VariablesCoordinate GeometryAlgebraSlope And Y InterceptIntroduction To PolynomialsMathematics

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