if x and y are integers and y=|x
|, does y equal 7
If we carefully look at the question we can see that "does y equal 7" actually means that y doesn't depend on x and then you can see that if we open two moduli with same signs (++ or --), x and -x disappear and 3+4 is 7. So, let's see when we can open moduli ++ or --:
++) x>-3 and x<4 or x e (-3,4)
--) x<-3 and x>4 - it can't be.
So, if x between -3 and 4, y =7. Now, look at our statements: it is obvious that we need two statements.
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