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What is the value of (q) for the equations (7x+qy=29) and (14x+10y=58) to have infinitely many solutions?

Answer and explanation

Correct answer: 5

For two linear equations to have infinitely many solutions, a_1/a_2=b_1/b_2=c_1/c_2 must hold. Here, a_1/a_2=7/14=1/2 and c_1/c_2=29/58=1/2 . Therefore, q/10=1/2 , giving q=5 . For instance, if q=4, the coefficient ratio becomes 4/10=2/5, so the equations are not dependent. Exam tip: For infinitely many solutions, check that all three ratios are equal.

Related tags

Linear EquationsInfinitely Many SolutionsDependent EquationsSolvability ConditionsParameter ValueConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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