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What is the value of (a) for the equations (10x+3y=44) and (20x+ay=88) to have infinitely many solutions?

Answer and explanation

Correct answer: 6

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, \(\frac{10}{20}=\frac{44}{88}=\frac{1}{2}\), so \(\frac{3}{a}=\frac{1}{2}\), which gives \(a=6\). The nearby distractor 5 is incorrect because \(\frac{3}{5}\neq\frac{1}{2}\). Exam tip: for infinitely many solutions, verify that all three coefficient-to-constant ratios are equal.

Related tags

Linear EquationsInfinitely Many SolutionsSolvability ConditionsParameter ValueConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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