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Which line cuts the (y)-axis at ((0,18)) and decreases (y) by (49) when (x) increases by (7)?

Answer and explanation

Correct answer: \(y=-7x+18\)

When \(x\) increases by \(7\), \(y\) decreases by \(49\), so the slope is \(m=\frac{-49}{7}=-7\). The given \(y\)-intercept is \(18\). Substituting these in \(y=mx+c\) gives \(y=-7x+18\). Option C has slope \(-49\), which would mean that \(y\) decreases by 49 for every increase of 1 in \(x\). Exam tip: find slope using \(\Delta y/\Delta x\).

Related tags

Linear EquationsSlopeY-InterceptNegative SlopeCoordinate GeometrySlope And Y InterceptIntroduction To PolynomialsMathematics

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