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If (x+2y=21) and (y=8), what will be the value of (x)?

Answer and explanation

Correct answer: 5

Given y=8, substitute it into x+2y=21: x+2(8)=21, so x+16=21. Subtracting 16 from both sides gives x=5. Option 4 may seem close, but substituting it gives x+2y=20, not 21. Exam tip: after substitution, multiply first and then isolate the unknown term.

Related tags

Linear EquationsSubstitution MethodValue Of XAlgebraClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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