Question

X is less than or equal to -8 graphed on a number line

Answer 1

What you must do for this case is to take all the numbers that satisfy the following inequality
 x <= - 8
 Notice that the inequality solution is
 (-inf, -8]
 In the graph the parenthesis implies that the value of minus infinity is not included. The bracket implies that the value x = -8 is included in the solution of the inequality.
 See attached graph.