A graph may or may not represent a function.
Graph (b) shows y as a function of x.
From the attachment, we have the following highlights
- Graphs (c) and (d) would fail the vertical line test, because all x-values correspond to at least 2 y-values
- Graphs (a) would fail the vertical line test, because when x = 0, y = 1 and y = -2
Only graph (b) would pass the vertical line test, because no x-value have multiple y-values.
Hence, graph (b) shows y as a function of x.
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