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The line (y=-6x+c) passes through ((5,-18)). What is its (y)-intercept?

Answer and explanation

Correct answer: 12

The line is \(y=-6x+c\) and it passes through \((5,-18)\). Substituting \(x=5\) and \(y=-18\) gives \(-18=-6(5)+c=-30+c\). Hence, \(c=12\). In the form \(y=mx+c\), \(c\) is the \(y\)-intercept, so the correct answer is 12. For example, 13 would not make the given point satisfy the equation. Exam tip: in \(y=mx+c\), identify the \(y\)-intercept directly as \(c\).

Related tags

Linear EquationsY-InterceptSlope-Intercept FormCoordinate GeometrySubstitutionSlope And Y InterceptIntroduction To PolynomialsMathematics

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