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Which equation will represent a coincident line with \(x+2y=9\)?

Answer and explanation

Correct answer: \(2x+4y=18\)

In option A, dividing every term of \(2x+4y=18\) by 2 gives \(x+2y=9\). Hence both equations have exactly the same graph and represent coincident lines. Options B and C produce distinct lines with the same slope, while option D has a different slope. Exam tip: for coincident lines, \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\).

Related tags

Coincident LinesEquivalent EquationsGraphical MethodLinear EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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