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What is the value of (d) for the equations (6x+dy=54) and (18x+30y=162) to have infinitely many solutions?

Answer and explanation

Correct answer: 10

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, \(\frac{6}{18}=\frac{54}{162}=\frac{1}{3}\), so \(\frac{d}{30}=\frac{1}{3}\), giving \(d=10\). If d were 9 or 11, the coefficient ratios would not remain \(1:3\). Exam tip: first compare the ratios of the known coefficients and constants, then use that ratio to find the unknown coefficient.

Related tags

Linear EquationsInfinitely Many SolutionsSolvability ConditionsParameter ValueClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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