Question 1016728
-5a <= -25

divide each side by 5

-a <= -5

Now, a side note, say -X>1. Can we just multiply both sides by -1 and get X>-1? In the first equation, -2 is a solution, as -(-2)>1 is true. But is -2>-1? No, sir, it's not. We must change equality sign when multiplying by a negative number. 

a >= 5

This is the key to solving these, and for classmates getting this wrong on a test, the most common error. Now you won't make this mistake. 

Last, it's the same if we just divided both sides by -5, multiply or dividing by a negative number forces an equality sign flip. Clear enough, I hope!