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What type of lines are represented by the equations \(x+2y=7\) and \(3x+6y=21\)?

Answer and explanation

Correct answer: Coincident

The second equation is exactly three times the first: multiplying \(x+2y=7\) by 3 gives \(3x+6y=21\). Hence both equations represent the same graph, so the lines are coincident. For parallel and distinct lines, the ratios of the coefficients of \(x\) and \(y\) are equal but the ratio of the constants is different. Exam tip: if \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\), the two lines are coincident.

Related tags

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

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