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If (ax+6y=18) and (10x+15y=47) have no solution, what will (a) be?

Answer and explanation

Correct answer: 4

For two linear equations to have no solution, the ratios of the coefficients of x and y must be equal, while the ratio of the constant terms must be different. Thus, \(\frac{a}{10}=\frac{6}{15}\neq\frac{18}{47}\). Since \(\frac{6}{15}=\frac{2}{5}\), we get \(a=10\times\frac{2}{5}=4\). Option 3 is incorrect because it would make \(a/10=3/10\), which is not equal to \(6/15\). Exam tip: for inconsistent equations, check equal coefficient ratios but unequal constant-term ratios.

Related tags

Linear EquationsSolvability ConditionsNo SolutionParameter ValueConsistencyConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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