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What will (m) be for infinitely many solutions of (7x+my=28) and (x+2y=4)?

Answer and explanation

Correct answer: 14

For two linear equations to have infinitely many solutions, \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\) must hold. Here, \(\frac{7}{1}=\frac{28}{4}=7\), so \(\frac{m}{2}=7\), giving \(m=14\). Therefore, option C is correct. Exam tip: infinitely many solutions occur when the coefficients and constants of both equations are proportional.

Related tags

Linear EquationsSolvability ConditionsInfinite SolutionsParameterConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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