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What is the number of solutions of 12x - 7y = 5 and 18x - 11y = 8?

Answer and explanation

Correct answer: Unique solution

The governing concept is the solvability condition for two linear equations. For a₁x + b₁y + c₁ = 0 and a₂x + b₂y + c₂ = 0, a unique solution exists when a₁/a₂ is different from b₁/b₂. Rewriting the equations gives 12x − 7y − 5 = 0 and 18x − 11y − 8 = 0. Their coefficient ratios are 12/18 = 2/3 and (−7)/(−11) = 7/11. Since 2/3 is not equal to 7/11, the corresponding lines have different slopes and must intersect at exactly one point. Therefore, the pair has a unique solution, so option C is correct. No solution would require parallel distinct lines, while infinitely many solutions would require coincident lines.

Related tags

Class10Linear-EquationsConditions-For-SolvabilityUnique-SolutionConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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