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by DanaJ » Thu May 14, 2009 5:35 am
y = 1/2 means that y^2 = 1/4. This makes x^2 = 1 - 1/4 = 3/4. So x is either sqrt(3/4) or -sqrt(3/4).

Since you don't have these answer choices, then the question must be wrong.
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