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What will be the value of (m) for the equations (mx+5y=15) and (18x+15y=45) to have infinitely many solutions?

Answer and explanation

Correct answer: 6

A pair of linear equations has infinitely many solutions when \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\). Here, \(\frac{5}{15}=\frac{15}{45}=\frac{1}{3}\), so \(\frac{m}{18}=\frac{1}{3}\), giving \(m=6\). Therefore, option C is correct. For instance, if \(m=5\), then \(\frac{m}{18}=\frac{5}{18}\), which is not equal to \(\frac{1}{3}\). Exam tip: For infinitely many solutions, all three corresponding ratios must be equal; equality of only two ratios is not sufficient.

Related tags

Linear EquationsInfinitely Many SolutionsSolvability ConditionsParameterHigher Order ThinkingConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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