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What is the condition for the pair of linear equations \(a_1x+b_1y+c_1=0\) and \(a_2x+b_2y+c_2=0\) to have infinitely many solutions?

Answer and explanation

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

When \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\), both equations represent the same line. Hence, every point on that line satisfies both equations, giving infinitely many solutions. In option B, the lines are distinct and parallel, so there is no solution. Exam tip: equality of all three ratios means infinitely many solutions; if only the first two ratios are equal and the third differs, there is no solution.

Related tags

Linear EquationsInfinitely Many SolutionsConsistent Dependent EquationsCoefficient RatiosClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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