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If (x=3y-4) and (2x+5y=37), what is the value of (y)?

Answer and explanation

Correct answer: \(\frac{45}{11}\)

Substitute \(x=3y-4\) into \(2x+5y=37\): \(2(3y-4)+5y=37\). Thus, \(6y-8+5y=37\), so \(11y=45\). Therefore, \(y=\frac{45}{11}\). For example, \(\frac{42}{11}\) would give \(11y=42\), not \(11y=45\). Exam tip: while substituting, distribute the coefficient \(2\) to both terms inside the bracket.

Related tags

Pair Of Linear EquationsSubstitution MethodLinear AlgebraFractional SolutionsClass 10 MathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In T

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