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What is the solution of (x+2y=13) and (3x-2y=7)?

Answer and explanation

Correct answer: \(x=5,\ y=4\)

Adding the two equations gives \((x+2y)+(3x-2y)=13+7\), so \(4x=20\). Hence, \(x=5\). Substituting this into \(x+2y=13\) gives \(5+2y=13\), and therefore \(y=4\). Thus, the solution is \(x=5,\ y=4\). In option C, \(x=6\) does not satisfy the first equation. Exam tip: adding equations is a quick elimination method when terms have opposite coefficients.

Related tags

Pair Of Linear EquationsElimination MethodSubstitution CheckAlgebraClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variabl

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