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If the graphs of the two linear equations \(a_1x+b_1y+c_1=0\) and \(a_2x+b_2y+c_2=0\) are coincident lines, which condition correctly shows that they have infinitely many solutions?

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 every point on that line satisfies both equations and gives infinitely many solutions. Hence all three coefficient ratios must be equal. In option B, the lines are parallel but distinct. Exam tip: for infinitely many solutions, check equality of all three ratios.

Related tags

Linear EquationsInfinite SolutionsCoincident LinesCoefficient RatiosGraph Of EquationsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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