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If (2x+ky=15) and (x-2y=1) have solution (x=5,\ y=2), what is the value of (k)?

Answer and explanation

Correct answer: \(k=\frac{5}{2}\)

Substitute the given solution \(x=5,\ y=2\) into the first equation \(2x+ky=15\). This gives \(2(5)+k(2)=15\), or \(10+2k=15\). Hence \(2k=5\), so \(k=\frac{5}{2}\). If \(k=3\), the left-hand side becomes \(10+6=16\), not 15. Exam tip: To find a parameter from a given solution, substitute the coordinates into the equation containing that parameter.

Related tags

Pair Of Linear EquationsSubstitution MethodParameterValue Of KClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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