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What will (a) be for the equations (7x+ay=49) and (21x+18y=147) 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, \(\frac{7}{21}=\frac{49}{147}=\frac{1}{3}\). Therefore, \(\frac{a}{18}=\frac{1}{3}\), giving \(a=6\). Hence, option C is correct. Exam tip: For infinitely many solutions, all three corresponding coefficient and constant ratios must be equal; equality of only two ratios is not sufficient.

Related tags

Linear EquationsInfinitely Many SolutionsSolvability ConditionsParameterGrade 10Conditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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