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Which relation is correct for (8x+12y=40) and (2x+3y=12)?

Answer and explanation

Correct answer: \(\frac{8}{2}=\frac{12}{3}\ne\frac{40}{12}\)

Compare the ratios of corresponding coefficients: \(\frac{8}{2}=4\) and \(\frac{12}{3}=4\), whereas \(\frac{40}{12}=\frac{10}{3}\). Hence, \(\frac{8}{2}=\frac{12}{3}\ne\frac{40}{12}\), so the two lines are parallel and distinct and the pair has no solution. Option B is incorrect because the ratio of the constant terms is not equal to the other two ratios. Exam tip: If \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\ne\frac{c_1}{c_2}\), the pair of linear equations has no solution.

Related tags

Linear EquationsSolvability ConditionsRatio TestNo SolutionParallel LinesConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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