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If the line represented by the equation \(2x+ay=18\) is coincident with the line \(2x+3y=18\), what is the value of \(a\)?

Answer and explanation

Correct answer: 3

For two lines to be coincident, the ratios of their corresponding coefficients must be equal. Writing both equations in standard form gives \(\frac{2}{2}=\frac{a}{3}=\frac{18}{18}\). Hence \(\frac{a}{3}=1\), so \(a=3\). Option 2 refers only to the coefficient of \(x\), so it is not correct. Exam tip: for coincident lines, use \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\).

Related tags

ParameterCoincident LinesGraphical MethodLinear EquationsCoefficient ComparisonGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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