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If (x-y=8) and (x+y=14), what is the value of (x)?

Answer and explanation

Correct answer: 11

Add the two given equations: \((x-y)+(x+y)=8+14\). The terms \(-y\) and \(+y\) cancel, giving \(2x=22\). Hence, \(x=11\). Option 22 is the value of \(2x\), not of \(x\). Exam tip: In a pair of linear equations, add equations when one variable has opposite signs so that it is eliminated.

Related tags

Algebraic ExpressionsLinear EquationsElimination MethodSolving EquationsIntroduction To PolynomialsMathematicsClass 9 Mcq

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