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What is the value of (a) for (ax+6y=14) and (2x+3y=7) to have infinitely many solutions?

Answer and explanation

Correct answer: \(a=4\)

For infinitely many solutions, both linear equations must represent the same line. Hence the ratios of corresponding coefficients must be equal: \(\frac{a}{2}=\frac{6}{3}=\frac{14}{7}=2\). Thus, \(\frac{a}{2}=2\) gives \(a=4\). If \(a=2\), the ratio of the coefficients of \(x\) does not match the other ratios. Exam tip: for infinitely many solutions, check \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\).

Related tags

Pair Of Linear EquationsInfinite SolutionsCoefficient RatiosParameterElimination MethodClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two Variables

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