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The line (y=5x+b) passes through ( (1,12) ) and ( (4,27) ). What is (b)?

Answer and explanation

Correct answer: \(7\)

Substitute the point \((1,12)\) in \(y=5x+b\): \(12=5(1)+b\). Hence, \(b=12-5=7\). Checking with \(x=4\), we get \(y=5(4)+7=27\), so the second point also lies on the line. Taking \(b=5\) is incorrect because 5 is the slope, not the y-intercept. Exam tip: substitute the coordinates of a given point into the line equation to find an unknown constant.

Related tags

Linear EquationsSlopeY-InterceptCoordinate GeometrySubstitutionGrade 9 MathematicsSlope And Y InterceptIntroduction To Polynomials

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