60. tan a = -, a lies in quadrant II, and cos ß = }, B lies in
quadrant I.

a) 7x=7

step-by-step explanation:

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.