Vertical
Vertical. If all vertical lines intersect the graph once, then the graph is a function. Not a function, Relation. Function. Function. The y-axis crosses the curve 3 times. (0, 4). End at y = 4. f (0) = y. = 4. f (3) = y. = -3. f (-2) = y. = 0. (0, 4).
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