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In (x=10-2y) and (x+y=7), what will be the value of (y)?

Answer and explanation

Correct answer: \(y=3\)

From the first equation, \(x=10-2y\). Substituting it into \(x+y=7\) gives \((10-2y)+y=7\), or \(10-y=7\). Hence, \(y=3\). If \(y=2\), then \(x=6\) and \(x+y=8\), so it does not satisfy the second equation. Exam tip: combine like terms carefully after substitution, especially their signs.

Related tags

Pair Of Linear EquationsSubstitution MethodLinear EquationsValue Of YClass 10 AlgebraAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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