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Which conclusion is correct for the equations 7x − 4y = 29 and 21x − 12y = 87?

Answer and explanation

Correct answer: There are infinitely many solutions

Multiply the first equation 7x − 4y = 29 by 3. This gives 21x − 12y = 87, which is precisely the second equation. Consequently, the equations are dependent and their graphs coincide. The ratio check gives 21/7 = (−12)/(−4) = 87/29 = 3, so the condition for infinitely many solutions is satisfied. Every point on the common line is a solution; therefore option C is correct, not the options for a unique or no solution.

Related tags

Linear EquationsRatio ConditionCoincident LinesInfinite SolutionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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