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What is the value of (b) for the equations (bx+8y=32) and (12x+24y=71) to have no solution?

Answer and explanation

Correct answer: \(4\)

A pair of linear equations has no solution when the ratios of the coefficients of \(x\) and \(y\) are equal, but the ratio of the constants is different. Thus, \(\frac{b}{12}=\frac{8}{24}=\frac{1}{3}\), which gives \(b=4\). Also, \(\frac{32}{71}\ne\frac{1}{3}\), so the two lines are distinct and parallel, giving no solution. Exam tip: First equate the coefficient ratios, then check that the constant ratio is different.

Related tags

Pair Of Linear EquationsNo SolutionConsistent EquationsParallel LinesParameter ConditionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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