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If (m=-5) and (3c+m=31) in (y=mx+c), what is the (y)-intercept?

Answer and explanation

Correct answer: 12

In the line form \(y=mx+c\), \(c\) is the value of the \(y\)-intercept. Substituting \(m=-5\) into \(3c+m=31\) gives \(3c-5=31\). Hence, \(3c=36\), so \(c=12\). Therefore, the \(y\)-intercept is 12. Choosing 11 would be incorrect because it does not satisfy \(3c-5=31\). Exam tip: substitute the given value of \(m\) into the relation first, then solve for \(c\).

Related tags

Linear EquationsSlope Intercept FormY-InterceptSubstitutionCoordinate GeometrySlope And Y InterceptIntroduction To PolynomialsMathematics

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