Question

Which graph represents x - 1 ≤ 3

Answer 1

The first graph. 

The  equation is x - 1 $\leq$ 3
In order to solve it, you need to get x by itself.
Add 1 to both sides.  3+1=4
x $\leq$ 4

Since this is your sign $\leq$ the arrow has to point towards the left, and the circle needs to be colored in.