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If (kx+5y=42) and (x-y=3) have solution (x=8,\ y=5), what is the value of (k)?

Answer and explanation

Correct answer: \(\frac{17}{8}\)

The given solution \(x=8, y=5\) must satisfy \(kx+5y=42\). Substituting gives \(8k+5(5)=42\), or \(8k+25=42\). Hence \(8k=17\), so \(k=\frac{17}{8}\). For example, \(\frac{19}{8}\) would not make the left-hand side equal to 42. Exam tip: when a solution is given, substitute it into the equation containing the unknown parameter.

Related tags

Pair Of Linear EquationsSubstitution MethodParameterLinear EquationsClass 10 AlgebraAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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