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Which statement is correct for the equations (7x+8y=26) and (14x+15y=51)?

Answer and explanation

Correct answer: \(\frac{7}{14}\ne\frac{8}{15}\), so there is one unique solution

The coefficient ratios are unequal: \(\frac{7}{14}=\frac{1}{2}\), whereas \(\frac{8}{15}\ne\frac{1}{2}\). Thus, \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\), so the two lines intersect at exactly one point and the pair has a unique solution. Options C and D describe the inconsistent and coincident-line cases, respectively, neither of which applies here. Exam tip: When \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\), a pair of linear equations in two variables has a unique solution.

Related tags

Linear EquationsSolvability ConditionsRatio ComparisonUnique SolutionClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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