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Which line cuts the (y)-axis at ( (0,16) ) and decreases (y) by (42) when (x) increases by (6)?

Answer and explanation

Correct answer: \(y=-7x+16\)

As \(x\) increases by \(6\), \(y\) decreases by \(42\), so the slope is \(m=\frac{-42}{6}=-7\). The line crosses the \(y\)-axis at \((0,16)\), hence its \(y\)-intercept is \(16\). Therefore, the equation is \(y=-7x+16\). In \(y=-42x+16\), the slope is \(-42\), not the required rate of change. Exam tip: find the slope using \(\frac{\Delta y}{\Delta x}\) first, then use the \(y\)-intercept.

Related tags

Linear EquationsSlopeY-InterceptNegative SlopeCoordinate GeometrySlope And Y InterceptIntroduction To PolynomialsMathematics

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