The graph shows a line and two similar triangles.

On a coordinate plane, a line goes through (0, 2) and (6, 4). A small triangle has a rise of 1 and run of 3 and a larger triangle has a rise of 2 and run of 6.

What is the equation of the line?
y = 3 x
y = one-third x
y = one-third x + 2
y = 3 x + 2