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What will (k) be for the equations (kx+14y=42) and (18x+21y=63) to have infinitely many solutions?

Answer and explanation

Correct answer: 12

For two linear equations to have infinitely many solutions, the condition is \(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\). Here, \(\frac{14}{21}=\frac{42}{63}=\frac{2}{3}\), so \(\frac{k}{18}=\frac{2}{3}\), giving \(k=12\). Therefore, option C is correct. In an exam, check the constant-term ratio as well as the coefficient ratios; matching only the variable coefficients is not sufficient for infinitely many solutions.

Related tags

Linear EquationsSolvability ConditionsInfinitely Many SolutionsParameter ValueClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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