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What should (s) be for (x+4y=9) and (2x+8y=s) to be consistent and dependent?

Answer and explanation

Correct answer: 18

For a pair of consistent and dependent linear equations, one equation must be an exact multiple of the other. Here, the second equation is twice the first: \(2(x+4y=9)\), so its right-hand side must be \(2\times9=18\). Therefore, \(s=18\). Values such as 17 or 19 would not produce the same equation or the same line. Exam tip: For dependent equations, check whether \(a_1/a_2=b_1/b_2=c_1/c_2\).

Related tags

Pair Of Linear EquationsConsistent Dependent EquationsConditions For SolvabilityParameter ValuePair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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