The function which compares the growth of both functions is; The function y = 3x is growing slower than y = 3^x.
The graphs in the task content are given as y=3x which is a linear graph, and y=3^x which is the exponential graph.
Hence, it follows that although both graphs are growing, the graph of function y = 3x is growing slower than y = 3^x.
Read more on growing functions;
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