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The line (y=mx-9) passes through ( (-3,6) ). What is its slope?

Answer and explanation

Correct answer: \(-5\)

Substitute the point \((-3,6)\) into the line: \(6=m(-3)-9\). Hence, \(6=-3m-9\), so \(15=-3m\) and \(m=-5\). Therefore, the slope is \(-5\). The value \(5\) may result from a sign error; the negative \(x\)-coordinate gives \(-3m\). Exam tip: substitute the given point carefully, keeping the signs intact, and then solve for the slope.

Related tags

Slope Of LineY-InterceptLinear EquationsCoordinate GeometrySubstitutionSlope And Y InterceptIntroduction To PolynomialsMathematics

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