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If (x=2y+1) and (3x-y=18), what are (x) and (y)?

Answer and explanation

Correct answer: \((7,3)\)

From the first equation, \(x=2y+1\). Substituting this into \(3x-y=18\) gives \(3(2y+1)-y=18\). Thus, \(6y+3-y=18\), so \(5y=15\) and \(y=3\). Hence, \(x=2(3)+1=7\), making \((7,3)\) the correct pair. Option \((5,2)\) satisfies the first equation but not the second one. Exam tip: verify the obtained values in both original equations.

Related tags

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

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