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Bunuel
What is x ?

(1) x^2 + y = 17
(2) y = 2x + 2

Many students will incorrectly answer C, because they believe that, if we have a system of two different equations with two variables, then we can solve that system for the two variables.
The important thing here is that, in order to apply the above rule, the two equations must be LINEAR equations.
In this case, the equation x^2 + y = 1 is not a linear equation. So, the rule doesn't apply.
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