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If (a-b=7) and (a+b=17), what is the value of (a)?

Answer and explanation

Correct answer: 12

Add the two given equations:

a-b+a+b=7+17.

The terms involving b cancel, so

2a=24.

Hence,

a=12.

Option 10 may result from incorrectly treating the result of subtracting the equations as a; subtraction actually gives 2b. Exam tip: add equations when a variable has opposite signs so that it cancels out.

Related tags

Algebraic ExpressionsLinear EquationsSimultaneous EquationsElimination MethodValue Of VariablesIntroduction To PolynomialsMathematicsClass 9 Mcq

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