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In the line \(y=-\frac{3}{2}x+10\), how much should (x) increase to decrease (y) by (18)?

Answer and explanation

Correct answer: 12

The slope is \(-\frac{3}{2}\). Thus, for every increase of 2 units in \(x\), \(y\) decreases by 3 units. If the increase in \(x\) is \(\Delta x\), the decrease in \(y\) is \(\frac{3}{2}\Delta x\). Hence, \(\frac{3}{2}\Delta x=18\), so \(\Delta x=12\). If 13 were chosen, the decrease would be \(\frac{3}{2}\times13=19.5\), not 18. Exam tip: With a negative slope, increasing \(x\) decreases \(y\).

Related tags

Linear EquationsSlopeRate Of ChangeCoordinate GeometryAlgebraSlope And Y InterceptIntroduction To PolynomialsMathematics

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