The point of inequalities is that you can plug in any number for y that makes it true! so if you plug in 5000, you'll get 4997 which is greater than -8.
So
for this, you get y by itself. set it as an equality.
y-3=-8
y=-5
then you plug it back in. y <-5
so any number of y that's less than -5 will solve it successfully