What is the constant proportionality y/x

The constant of proportionality is k

Step-by-step explanation:

table 3 represents a direct variation function. : )

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.