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Choose the correct option for (4x-5y=1) and (8x-9y=3).

Answer and explanation

Correct answer: One unique solution

Compare the coefficient ratios after writing the equations in standard form: \(\frac{a_1}{a_2}=\frac{4}{8}=\frac{1}{2}\) and \(\frac{b_1}{b_2}=\frac{-5}{-9}=\frac{5}{9}\). Since these ratios are unequal, the two lines intersect at exactly one point, so the pair has a unique solution. Infinitely many solutions or the same line require all corresponding ratios to be equal, while no solution requires \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\ne\frac{c_1}{c_2}\). Exam tip: first compare \(a_1/a_2\) and \(b_1/b_2\).

Related tags

Linear EquationsUnique SolutionRatio TestPair Of LinesSolvabilityConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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