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Solve (4x+3y=42) and (2x-y=6).

Answer and explanation

Correct answer: \((6, 6)\)

From the second equation, \(2x-y=6\), we get \(y=2x-6\). Substituting this into \(4x+3y=42\) gives \(4x+3(2x-6)=42\), so \(10x=60\) and hence \(x=6\). Then \(y=2(6)-6=6\). Therefore, the solution is \((6,6)\). For example, \((7,4)\) gives \(40\), not \(42\), in the first equation. Exam tip: always verify the obtained pair in both original equations.

Related tags

Pair Of Linear EquationsSubstitution MethodLinear Equations In Two VariablesClass 10 MathematicsAlgebraic MethodsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linea

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