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What is the value of (a) for the equations (5x+2y=18) and (15x+ay=54) to have infinitely many solutions?

Answer and explanation

Correct answer: 6

For two linear equations to have infinitely many solutions, the condition is 5/15 = 2/a = 18/54. Since 5/15 and 18/54 are both equal to 1/3, 2/a = 1/3 gives a = 6. Therefore, option C is correct. Exam tip: all three corresponding coefficient and constant ratios must be equal; checking only two ratios is not sufficient.

Related tags

Linear EquationsConditions For SolvabilityParameterInfinite SolutionsClass 10 MathematicsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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