Look at the table. xy
516
619
722
Which equation has the same y-intercept?

y = 2x + 1
y = x + 11
y = –3x + 5
y = –1x + 4

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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.