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Which conclusion is correct for the equations 6x − 5y = 17 and 18x − 15y = 51?

Answer and explanation

Correct answer: There are infinitely many solutions

Multiplying every term of 6x − 5y = 17 by 3 gives 18x − 15y = 51, which is the second equation. Hence the two equations are not independent; they are different algebraic forms of the same line. In ratio form, 18/6 = (−15)/(−5) = 51/17 = 3, confirming coincidence. A coincident pair has every point of the common line as a solution, so the number of solutions is infinite, not one or zero.

Related tags

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

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