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What is the value of (a) for the equations (5x+ay=45) and (20x+28y=180) to have infinitely many solutions?

Answer and explanation

Correct answer: 7

For two linear equations to have infinitely many solutions, the ratios of the corresponding coefficients and constants must be equal: 5/20 = a/28 = 45/180. Since 5/20 and 45/180 are both 1/4, we get a/28 = 1/4, so a = 7. Therefore, option C is correct. Exam tip: For infinitely many solutions, all three corresponding ratios must be equal; equality of only two ratios is not sufficient.

Related tags

Linear EquationsConditions For SolvabilityInfinite SolutionsParameterClass 10Pair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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