Is 8x greater than or equal to - 40

I think you are asking if - 8x ≥ 40, find x. What we do here is we divide negative 8 by both sides. This gives us x ≥ 5. BUT, we have to be careful! When we divide an inequality on both sides by a negative number, we have to switch the sign. Thus, our answer is x ≤ 5.