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What type of lines are 9x − 6y = 21 and 3x − 2y = 7?

Answer and explanation

Correct answer: Coincident

The governing concept is the consistency test for a pair of linear equations. Write the equations as 9x − 6y − 21 = 0 and 3x − 2y − 7 = 0. Here, a1/a2 = 9/3 = 3, b1/b2 = (−6)/(−2) = 3, and c1/c2 = (−21)/(−7) = 3. Since all three corresponding ratios are equal, the two equations represent the same straight line. Therefore every point on one line also lies on the other, so the pair has infinitely many solutions. Hence option C, coincident lines, is correct. Equal coefficients only for x and y with unequal constants would instead indicate distinct parallel lines.

Related tags

Pair Of Linear EquationsCoincident LinesConsistency TestInfinite SolutionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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