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On solving (2x+5y=0) and (3x-y=17), what is (y)?

Answer and explanation

Correct answer: \(-2\)

From the second equation, \(3x-y=17\), we get \(y=3x-17\). Substituting this into \(2x+5y=0\) gives \(2x+5(3x-17)=0\), so \(17x=85\) and \(x=5\). Then \(y=3(5)-17=-2\). Therefore, the correct answer is \(-2\). The value \(-1\) does not satisfy both equations together. Exam tip: verify the obtained values in both original equations.

Related tags

Pair Of Linear EquationsSubstitution MethodAlgebraic MethodsClass 10 MathematicsLinear Equations In Two VariablesAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linea

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