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If (x=5y-8) and (4x+3y=61), what is the value of (y)?

Answer and explanation

Correct answer: \(y=\frac{93}{23}\)

From the first equation, \(x=5y-8\). Substituting this into \(4x+3y=61\) gives \(4(5y-8)+3y=61\). Thus, \(20y-32+3y=61\), so \(23y=93\). Therefore, \(y=\frac{93}{23}\), which is option C. Taking \(\frac{88}{23}\) would give \(23y=88\), which does not satisfy the given equation. Exam tip: after substitution, multiply the number outside the bracket by every term inside it.

Related tags

Pair Of Linear EquationsSubstitution MethodLinear AlgebraClass 10 MathematicsFractional SolutionAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Tw

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