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Which is the solution of \(7x-3y=20\) and \(2x+y=9\)?

Answer and explanation

Correct answer: \(\left(\frac{47}{13},\frac{23}{13}\right)\)

From the second equation, \(y=9-2x\). Substituting this into \(7x-3y=20\) gives \(7x-3(9-2x)=20\), so \(13x=47\). Hence, \(x=\frac{47}{13}\) and \(y=9-2\times\frac{47}{13}=\frac{23}{13}\). Although \((3,3)\) satisfies the second equation, it gives \(7(3)-3(3)=12\neq20\) in the first equation. Exam tip: always verify the ordered pair in both original equations.

Related tags

Pair Of Linear EquationsSubstitution MethodSimultaneous EquationsOrdered PairClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In T

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