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If (p+q=10) and (p-q=4), what is the value of (2p+q)?

Answer and explanation

Correct answer: 17

Adding the given equations gives \(2p=14\), so \(p=7\). Substituting \(p=7\) in \(p+q=10\) gives \(q=3\). Hence, \(2p+q=2(7)+3=17\). Option 14 is only the value of \(2p\); it does not include \(q\). Exam tip: Use addition or subtraction of the two linear equations to eliminate one variable quickly.

Related tags

Algebraic ExpressionsLinear EquationsSubstitution MethodElimination MethodVariable ValuesIntroduction To PolynomialsMathematicsClass 9 Mcq

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