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Find the value of \(x\) from \(3x+y=18\) and \(x+y=10\).

Answer and explanation

Correct answer: \(x=4\)

This pair is best solved by elimination because the coefficient of \(y\) is the same in both equations. Subtract the second equation from the first: \((3x+y)-(x+y)=18-10\). The \(y\)-terms cancel, giving \(2x=8\). Dividing by 2 gives \(x=4\), so option D is correct. Substitution confirms the result: putting \(x=4\) in \(x+y=10\) gives \(y=6\), and then \(3(4)+6=18\). The other options do not satisfy both equations simultaneously; for example, each would lead to a different value of \(y\) in the two equations. This illustrates the elimination method for a pair of linear equations.

Related tags

Pair Of Linear EquationsElimination MethodLinear EquationsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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