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What is the value of (p) for (px+2y=6) and (9x+6y=18) to have infinitely many solutions?

Answer and explanation

Correct answer: 3

For two linear equations to have infinitely many solutions, the ratios of their corresponding coefficients and constant terms must be equal. Here, p/9 = 2/6 = 6/18 = 1/3. Therefore, p/9 = 1/3, giving p = 3, so option C is correct. For example, if p = 2, the ratio of the x-coefficients would be 2/9, not 1/3; hence the equations would not have infinitely many solutions. Exam tip: For infinitely many solutions, always check the equality of all three corresponding ratios.

Related tags

Linear EquationsSolvability ConditionsInfinite SolutionsParameter ValueClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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