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Which line cuts the (y)-axis at ((0,-14)) and increases (y) by (54) when (x) increases by (6)?

Answer and explanation

Correct answer: \(y=9x-14\)

The slope is \(m=\frac{\Delta y}{\Delta x}=\frac{54}{6}=9\). The y-intercept is \(-14\), so substituting \(m=9\) and \(c=-14\) in \(y=mx+c\) gives \(y=9x-14\). Although \(y=54x-14\) has the correct intercept, its slope is 54, not 9. Exam tip: find the rate of change using \(\Delta y/\Delta x\).

Related tags

Linear EquationsSlopeY-InterceptCoordinate GeometryAlgebraPolynomialsSlope And Y InterceptIntroduction To Polynomials

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