Final answer:
The correct function for the graph is f(x) = 2x(4). This function represents a linear equation with a slope of 2 and a y-intercept of 0.
Step-by-step explanation:
The correct function for the graph is f(x) = 2x(4). This function represents a linear equation with a slope of 2 and a y-intercept of 0. The coefficient 4 multiplies the entire function, but it does not affect the shape of the graph since it is a horizontal line.