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Choose the correct statement about 3x − y = 4 and 6x − 2y = 9.

Answer and explanation

Correct answer: It has no solution

Put both equations into standard form: 3x − y − 4 = 0 and 6x − 2y − 9 = 0. The ratios of the x- and y-coefficients are 3/6 = 1/2 and (−1)/(−2) = 1/2. However, the constant ratio is (−4)/(−9) = 4/9, which is not 1/2. Thus the coefficient pairs are proportional, but the constants are not. Geometrically, the two equations represent distinct parallel lines: they have the same slope but different intercepts. Distinct parallel lines never intersect, so there is no ordered pair satisfying both equations. Therefore option C is correct. A unique solution would require intersecting lines, and infinitely many solutions would require all three ratios to be equal.

Related tags

Linear EquationsNo SolutionParallel LinesConditions For SolvabilityClass 10 MathematicsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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