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What is the value of (d) for the equations (5x+dy=40) and (20x+28y=160) to have infinitely many solutions?

Answer and explanation

Correct answer: 7

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, \(\frac{5}{20}=\frac{40}{160}=\frac{1}{4}\). Thus, \(\frac{d}{28}=\frac{1}{4}\), which gives \(d=7\). Therefore, option C is correct. Remember that the ratios of both variable coefficients and the constants must be equal; matching only one ratio is insufficient.

Related tags

Linear EquationsInfinitely Many SolutionsSolvability ConditionParameterDependent EquationsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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