Question 1172851
<pre>
 -y +5 ≥ 9 or 3y + 4 < -5.
    -y ≥ 4 or     3y < -9. 
    y ≤ -4    or   y < -3

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

Edwin</pre>