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If (5x-3y=19) and (2x+3y=26), what is the value of (x-y)?

Answer and explanation

Correct answer: \(\frac{43}{21}\)

Adding the two equations gives \(5x-3y+2x+3y=19+26\), so \(7x=45\). Hence, \(x=\frac{45}{7}\). Substituting this into \(2x+3y=26\) gives \(3y=26-\frac{90}{7}=\frac{92}{7}\), and thus \(y=\frac{92}{21}\). Therefore, \(x-y=\frac{135}{21}-\frac{92}{21}=\frac{43}{21}\). A value such as \(\frac{47}{21}\) can result from an error while subtracting fractions. Exam tip: add equations first when one variable has opposite coefficients.

Related tags

Pair Of Linear EquationsElimination MethodLinear AlgebraExpression EvaluationClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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