If g of x is equal to 3 x is graphed on a coordinate plane, what is the y -intercept of the graph?

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

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