SOLUTION: Can someone check my work http://prntscr.com/bm7bbb

Sorry, but they're both wrong.

The "4 if " tells us that the circle at (-1,4)
is included and therefore should be darkened "●" and the 
"-4 if " tells us that the circle at (-1,-4) is 
not included and should be open "o".

And in the other problem negative infinity is always written
left of infinity.
This: , not this:  
Edwin