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What is the value of (y) from (\frac{2x-3y}{5}=1) and (\frac{x+y}{2}=6)?

Answer and explanation

Correct answer: \(\frac{19}{5}\)

Multiplying the first equation by 5 gives \(2x-3y=5\), and multiplying the second equation by 2 gives \(x+y=12\). From \(x+y=12\), write \(x=12-y\). Substituting gives \(2(12-y)-3y=5\), so \(24-5y=5\). Hence, \(-5y=-19\) and \(y=\frac{19}{5}\). The nearby distractor \(\frac{21}{5}\) does not satisfy both equations together. Exam tip: In linear equations containing fractions, first clear the denominators by multiplying both sides appropriately.

Related tags

Pair Of Linear EquationsSubstitution MethodElimination MethodLinear AlgebraClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two

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