Graph (b) represents y as a function of x
For a graph to represent a function, the graph must pass the vertical line test
From the list of given options, graphs (a), (c) and (d) would not pass the vertical line test, because an x-value corresponds to multiple y-values
However, graph (b) would pass the vertical line test, because an x-value corresponds to exactly one y-value
Hence, graph (b) represents y as a function of x
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