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What is the value of (p) for the equations (px+6y=18) and (14x+21y=50) to have no solution?

Answer and explanation

Correct answer: 4

For two linear equations to have no solution, the condition is \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\ne\frac{c_1}{c_2}\). Here, \(\frac{6}{21}=\frac{2}{7}\), so \(\frac{p}{14}=\frac{2}{7}\), giving \(p=4\). Also, \(\frac{18}{50}=\frac{9}{25}\), which is not equal to \(\frac{2}{7}\); hence the lines are parallel and inconsistent. Exam tip: First equate the ratios of the variable coefficients to find the parameter, then verify that the ratio of constants is different.

Related tags

Linear EquationsNo SolutionSolvability ConditionsParameterConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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