book Maths Puzzle Numerical Ability

I am trying to get into level 2 algebra at my comm. college. Its been almost 8 years since i've been in school, so im a little rusty!!! Here are a few examples if you could please

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book Other Question

What is an example of a number that isnt a "real number"? MATCH EACH SYSTEM WITH THE CORRECT SOLUTION
X-Y=1
X=1/2Y+2

A. (3,2)
B. (3,3)
C.(-2,3)
D.(2,3)