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From (x=10-y) and (y=7), what is (x)?

Answer and explanation

Correct answer: \(x=3\)

Given \(x=10-y\) and \(y=7\), substitute 7 for \(y\) in the first equation: \(x=10-7=3\). Therefore, the correct option is \(x=3\). \(x=4\) would result only if \(y=6\), so it is a close but incorrect distractor. Exam tip: after substitution, check the subtraction sign and arithmetic carefully.

Related tags

Linear EquationsSubstitution MethodAlgebraGrade 10Variable ValueAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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