If g(x) = 3x is graphed on a coordinate plane, what is the y-intercept of the graph?

The y-intercept is the value of y where the graph crosses the y-axis, which happens when x = 0. Substituting into g(x) = 3x gives g(0) = 3 × 0 = 0. Therefore, the y-intercept is 0, choice A.

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