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The line (y=mx-11) passes through ((-4,9)). What is its slope?

Answer and explanation

Correct answer: \(-5\)

Substitute the point coordinates \(x=-4\) and \(y=9\) into the line equation: \(9=-4m-11\). Adding \(11\) to both sides gives \(20=-4m\), so \(m=-5\). Choosing \(5\) would result from a sign error. Exam tip: carefully track the negative sign when substituting a negative value of \(x\).

Related tags

Slope Of A LineLinear EquationsSubstitutionCoordinate GeometryAlgebraic SignsSlope And Y InterceptIntroduction To PolynomialsMathematics

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