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What will (a) be for the equations (5x+ay=35) and (15x+18y=105) to have infinitely many solutions?

Answer and explanation

Correct answer: 6

For two linear equations to have infinitely many solutions, the ratios of corresponding coefficients and constants must be equal: \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\). Here, \(\frac{5}{15}=\frac{35}{105}=\frac{1}{3}\), so \(\frac{a}{18}=\frac{1}{3}\), giving \(a=6\). Therefore, option C is correct. Exam tip: infinitely many solutions require all three corresponding ratios to be equal, not just one pair of ratios.

Related tags

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

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