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If (px+5y=43) and (3x-y=17) have solution (x=6,\ y=1), what is the value of (p)?

Answer and explanation

Correct answer: \(p=\frac{19}{3}\)

Substitute the given solution \(x=6,\ y=1\) into the first equation \(px+5y=43\). This gives \(6p+5=43\), so \(6p=38\) and hence \(p=\frac{38}{6}=\frac{19}{3}\). The second equation also checks out because \(3(6)-1=17\). If \(p=\frac{20}{3}\), the left-hand side of the first equation becomes \(45\), not \(43\). Exam tip: to find a parameter, substitute the given values of \(x\) and \(y\) into the equation containing that parameter.

Related tags

Linear EquationsParameterSubstitution MethodAlgebraClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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