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Which pair of equations will give a unique solution?

Answer and explanation

Correct answer: x + 3y = 10 and 3x + y = 10

For a pair a₁x+b₁y+c₁=0 and a₂x+b₂y+c₂=0, a unique solution occurs when a₁/a₂ is not equal to b₁/b₂. This means the two lines have different slopes and intersect at exactly one point. In option C, the coefficient ratios are 1/3 and 3/1, which are unequal, so the lines intersect uniquely. In option A, the second equation becomes the first divided by 2, so the lines coincide. In option B, the left side doubles but the constant does not, producing parallel distinct lines. In option D, the first equation is four times the second, so the lines coincide. Therefore C is the only correct choice.

Related tags

Unique SolutionCoefficient RatioLinear EquationsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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