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Which ratio relation is correct for the equations (4x+9y-31=0) and (12x+27y-93=0)?

Answer and explanation

Correct answer: \(\frac{4}{12}=\frac{9}{27}=\frac{-31}{-93}\)

For the first equation, \(a_1=4, b_1=9, c_1=-31\), and for the second, \(a_2=12, b_2=27, c_2=-93\). Thus, \(\frac{a_1}{a_2}=\frac{4}{12}=\frac{1}{3}\), \(\frac{b_1}{b_2}=\frac{9}{27}=\frac{1}{3}\), and \(\frac{c_1}{c_2}=\frac{-31}{-93}=\frac{1}{3}\). Since all three ratios are equal, the two lines are coincident and the pair has infinitely many solutions. Exam tip: To identify infinitely many solutions, compare all three ratios; equality of only the first two is not sufficient.

Related tags

Linear EquationsSolvability ConditionsRatio ComparisonInfinite SolutionsCoincident LinesConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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