Yes, your choice is correct. It's y = 6x. Because remember the slope intercept form. It's y = mx+b. The 'mx' part is the slope. So basically, if you say y = 6x, the slope is 6. It's 6/1 because all whole numbers can be fractions by putting 1 as their denominator.
The graph shows that you go up 6, then turn right 1. Which is the rise over run of 6/1. I hope this helps you.
