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If (lx+17y=68) and (20x+34y=139) have no solution, what will be the value of (l)?

Answer and explanation

Correct answer: 10

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, \(\frac{l}{20}=\frac{17}{34}=\frac{1}{2}\), so \(l=10\). Also, \(\frac{68}{139}\ne\frac{1}{2}\), confirming that the lines are parallel and inconsistent. Exam tip: First equate the ratios of the coefficients to find the parameter, and then verify that the ratio of constants is different.

Related tags

Linear EquationsSolvability ConditionsParameterParallel LinesClass 10Conditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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