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Choose the correct statement for the pair of equations 9x − 3y + 6 = 0 and 3x − y + 2 = 0.

Answer and explanation

Correct answer: There are infinitely many solutions

Write the equations as a₁x + b₁y + c₁ = 0 and a₂x + b₂y + c₂ = 0. Here, a₁/a₂ = 9/3 = 3, b₁/b₂ = (−3)/(−1) = 3, and c₁/c₂ = 6/2 = 3. Since all three ratios are equal, both equations represent the same, or coincident, line. Every point on that line satisfies both equations, so the pair has infinitely many solutions. Options A and D describe different conditions.

Related tags

Linear EquationsConditions For SolvabilityCoincident LinesInfinite SolutionsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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