Which graph represents the equation y=1/3x−4 ? bottom picture is my answers

The function is in slope-intercept form y=mx+b, where m is the slope and b is the y-intercept.
y = (1/3)x + -4. 
we know that the y-intercept=-4, so we can rue out the top left and bottom left graphs. 
m=slope= (1/3). We know the slope is positive, so we can rule out the bottom right graph. 

The top-right graph is the correct one.