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If (lx+15y=60) and (18x+45y=181) have no solution, what will be the value of (l)?

Answer and explanation

Correct answer: 6

For two linear equations to have no solution, the ratios of the coefficients of the variables must be equal, while the ratio of the constant terms must be different. Thus, \(\frac{l}{18}=\frac{15}{45}=\frac{1}{3}\), which gives \(l=6\). Also, \(\frac{60}{181}\neq\frac{1}{3}\), since \(180\neq181\); therefore, the two lines are distinct and parallel. If 5 or 7 were used, the coefficient ratios would not be equal, resulting in a unique solution. Exam tip: For no solution, remember \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\neq\frac{c_1}{c_2}\).

Related tags

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

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