Answer: Equivalent expressions
14⋅x or 6+8x
TF DOES THAT MEAN
HBHHHHHHHHHH
You didn't include any graphs but what you're looking for is a solid vertical line on x = 18 or the ordered pair (18, 0) where the whole left side of the line is shaded.
EDIT: I said whole left side of the graph; changed it to "line"