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If the equations (ax+4y=10) and (6x+8y=25) have no solution, what is the value of (a)?

Answer and explanation

Correct answer: 3

For two linear equations to have no solution, the ratios of the coefficients of both variables must be equal, while the ratio of the constant terms must be different. Thus, \(\frac{a}{6}=\frac{4}{8}=\frac{1}{2}\), which gives \(a=3\). Also, \(\frac{10}{25}=\frac{2}{5}\), which is not equal to \(\frac{1}{2}\); therefore, the two lines are parallel and inconsistent. Exam tip: For ‘no solution,’ first check that the variable-coefficient ratios are equal and then verify that the constant-term ratio is different.

Related tags

Pair Of Linear EquationsConditions For SolvabilityNo SolutionParameterParallel LinesPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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