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Which ratio relation is correct for the equations (10x+13y-71=0) and (30x+39y-213=0)?

Answer and explanation

Correct answer: \(\frac{10}{30}=\frac{13}{39}=\frac{-71}{-213}\)

All three ratios are equal: \(\frac{10}{30}=\frac{13}{39}=\frac{-71}{-213}=\frac{1}{3}\). Thus, every coefficient in the second equation is 3 times the corresponding coefficient in the first equation, so both equations represent the same line. The pair therefore has infinitely many solutions. Options A and D are incorrect because they wrongly treat one ratio as unequal. Exam tip: always compare the ratios of the coefficients of \(x\), \(y\), and the constant term, including their signs.

Related tags

Linear EquationsSolvability ConditionsRatio RelationCoincident LinesInfinite SolutionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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