Final answer:
The equation x = 16 has only one solution because it represents a constant value for x, describing a vertical line on a graph.
Step-by-step explanation:
The question is asking how many solutions there are to the equation x = 16. This is a linear equation, which means it has the form y = mx + b where m and b are constants. The equation x = 16 describes a vertical line on a graph, which means there is only one value for x, and thus, only one solution to the equation. This is supported by the fact that in an equation in the format of x = [number], the value of x is always the constant on the right-hand side and does not change.