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What is the value of (p) for the equations (px+8y=24) and (10x+20y=61) to have no solution?

Answer and explanation

Correct answer: 4

For two linear equations to have no solution, \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\neq\frac{c_1}{c_2}\) must hold. Here, \(\frac{8}{20}=\frac{2}{5}\), so \(\frac{p}{10}=\frac{2}{5}\) gives \(p=4\). Also, \(\frac{24}{61}\neq\frac{2}{5}\), so the two lines are parallel and distinct. Exam tip: For ‘no solution’, first equate the ratios of the variable coefficients and then verify that the constants’ ratio is different.

Related tags

Linear EquationsSolvability ConditionsNo SolutionParameterParallel LinesConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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