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Which condition is correct for the equations (12x+py=60) and (3x+5y=16) to have a unique solution?

Answer and explanation

Correct answer: \(p\ne20\)

For two linear equations to have a unique solution, the condition is \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\). Here, \(\frac{12}{3}=4\) and \(\frac{p}{5}\), so \(4\ne\frac{p}{5}\), which gives \(p\ne20\). Hence, option B is correct. If \(p=20\), then \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=4\), but \(\frac{c_1}{c_2}=\frac{60}{16}\), so the lines are parallel and there is no solution. Exam tip: For a unique solution, ensure that the ratios of the corresponding coefficients of the variables are unequal.

Related tags

Pair Of Linear EquationsUnique SolutionSolvability ConditionsParameterClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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