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If the graphs of two linear equations are coincident lines, which condition on the ratios of their coefficients is correct?

Answer and explanation

Correct answer: \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\)

Coincident lines represent the same line, so all corresponding coefficients must be in the same ratio: \(a_1/a_2=b_1/b_2=c_1/c_2\). Hence, there are infinitely many solutions. Exam tip: if only the first two ratios are equal and the third differs, the pair has no solution.

Related tags

Pair Of Linear EquationsCoincident LinesInfinitely Many SolutionsSolvability ConditionsCoefficient RatiosConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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