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If (cx+16y=64) and (21x+42y=130) have no solution, what will (c) be?

Answer and explanation

Correct answer: 8

For two linear equations to have no solution, the condition is \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\ne\frac{c_1}{c_2}\). Here, \(\frac{16}{42}=\frac{8}{21}\), so \(\frac{c}{21}=\frac{8}{21}\), giving \(c=8\). Also, \(\frac{64}{130}=\frac{32}{65}\), which is not equal to \(\frac{8}{21}\); therefore, the equations are inconsistent. The other values make the coefficients' ratios unequal and lead to a unique solution. Exam tip: equate the ratios of the variable coefficients first, then check that the constant-term ratio is different.

Related tags

Linear EquationsConditions For SolvabilityNo SolutionParameterGrade 10 MathematicsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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