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If (c=-12) and (m-c=21) in (y=mx+c), what is the slope?

Answer and explanation

Correct answer: 9

In the line equation, the slope is represented by \(m\). Substituting \(c=-12\) into \(m-c=21\) gives \(m-(-12)=21\). Thus, \(m+12=21\), so \(m=9\). If 8 were chosen, then \(8-(-12)=20\), which does not satisfy the given condition of 21. Exam tip: subtracting a negative number is the same as adding it.

Related tags

Linear EquationsSlopeY-InterceptSubstitutionAlgebraCoordinate GeometrySlope And Y InterceptIntroduction To Polynomials

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