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What will be the value of (m) for (3x+my=24) and (12x+28y=96) to have infinitely many solutions?

Answer and explanation

Correct answer: 7

For two linear equations to have infinitely many solutions, the condition is \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\). Here, \(\frac{3}{12}=\frac{24}{96}=\frac{1}{4}\). Therefore, \(\frac{m}{28}=\frac{1}{4}\), giving \(m=7\). Hence, option C is correct. Exam tip: For infinitely many solutions, the ratios of the coefficients of \(x\), \(y\), and the constants must all be equal.

Related tags

Pair Of Linear EquationsConditions For SolvabilityInfinite SolutionsParameter ValueClass 10 MathematicsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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