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Which pair of equations is consistent and dependent?

Answer and explanation

Correct answer: 2x + y = 6 and 4x + 2y = 12

A pair is consistent and dependent when both equations represent the same line, so it has infinitely many solutions. In option A, multiplying 2x + y = 6 by 2 gives 4x + 2y = 12, exactly the second equation. Thus the two equations are dependent and every point on their common line is a solution. Option B represents parallel distinct lines because the left sides are identical but the constants differ, so it has no solution. Option C contains two non-proportional equations and generally has one solution. Option D fixes x and y separately and does not form a dependent pair of identical line equations. Therefore A is correct.

Related tags

Consistent-DependentCoincident-LinesLinear-EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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