Answer: Choice C) y = 2x
The line goes through the origin, so the y intercept is b = 0
The slope is rise/run = 2/1 = 2 because we go up 2 units for every unit we go to the right. This is why m = 2.
Plug m = 2 and b = 0 into the slope intercept form to go from y = mx+b to y = 2x+0, which is the same as y = 2x.