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What is the value of (a) for (ax+9y=27) and (2x+3y=9) to have infinitely many solutions?

Answer and explanation

Correct answer: \(a=6\)

Two linear equations have infinitely many solutions when the ratios of their corresponding coefficients and constants are equal. Multiplying the second equation by 3 gives \(6x+9y=27\), which must coincide with the first equation \(ax+9y=27\). Therefore, \(a=6\). Exam tip: for infinitely many solutions, \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\).

Related tags

Linear EquationsInfinite SolutionsSubstitution MethodElimination MethodClass 10Conditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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