The graph that is not proportional is the graph C because it does not start from the origin.
What is a proportional graph?
A proportional graph shows a proportional relationship whereby the line goes up at a constant rate, and goes through the origin.
Therefore, as x increases, y increases and as x decreases, y decreases-and that the ratio between them always stays the same.
Hence, the graph that is not proportional is the graph C because it does not start from the origin.
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