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If (ax+9y=27) and (14x+21y=64) have no solution then what will (a) be?

Answer and explanation

Correct answer: (6)

For two linear equations to have no solution, the ratios of the corresponding coefficients must be equal, while the ratio of the constants must be different. Thus, \(\frac{a}{14}=\frac{9}{21}=\frac{3}{7}\), giving \(a=6\). Also, \(\frac{27}{64}\ne\frac{3}{7}\), so the equations are inconsistent and have no solution. Exam tip: first equate the ratios of the coefficients to find the parameter, then verify that the constants are not in the same ratio.

Related tags

Pair Of Linear EquationsConditions For SolvabilityNo SolutionParameterCoefficient RatiosPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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