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If (y=(b-11)x+(2b+5)) has slope (2), what is the (y)-intercept?

Answer and explanation

Correct answer: \(31\)

A line in the form \(y=mx+c\) has slope \(m\) and \(y\)-intercept \(c\). Here, the slope is \(b-11\). Given \(b-11=2\), we get \(b=13\). Therefore, the \(y\)-intercept is \(2b+5=2(13)+5=31\). Hence, option C is correct. \(29\) would result from incorrectly using \(b=12\). Exam tip: first equate the coefficient of \(x\) to the given slope, then substitute the parameter into the constant term.

Related tags

Linear EquationsSlopeY-InterceptParameter SubstitutionCoordinate GeometrySlope And Y InterceptIntroduction To PolynomialsMathematics

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