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Which line cuts the (y)-axis at ( (0,-11) ) and increases (y) by (40) when (x) increases by (5)?

Answer and explanation

Correct answer: \(y=8x-11\)

The slope is \(m=\frac{\Delta y}{\Delta x}=\frac{40}{5}=8\). Since the line meets the (y)-axis at (0,-11), its (y)-intercept is \(-11\). Substituting \(m=8\) and \(c=-11\) in \(y=mx+c\) gives \(y=8x-11\). The equation \(y=40x-11\) has slope 40, while \(y=-8x-11\) represents a decreasing line. Exam tip: calculate slope as \(\Delta y/\Delta x\).

Related tags

Linear EquationsSlopeY-InterceptCoordinate GeometryRate Of ChangeSlope And Y InterceptIntroduction To PolynomialsMathematics

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