Question 1172851
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I should also point out that if the word "and" were between them instead of "or",

-y + 5 ≥ 9 and 3y + 4 < -5.
    -y ≥ 4 and     3y < -9. 
    y ≤ -4    and   y < -3

If you say y ≤ -4 then you don't need to say y < -3 because if y is ≤ -4,
it's automatically < -3.  So y ≤ -4 covers all the possible cases.

Edwin</pre>