The equation - x = y + 7 written in slope-intercept form is

y = x + 7

y = - x - 7

y = - x + 7

I think that it's B, y = - x - 7 because first you'd subtract y to get it on the other side then add x and then you'd need to make the y positive so you would divide x + 7 by - 1 and that would make it y = - x - 7.

Step-by-step explanation:

Start with - x = y + 7. Subtract 7 from both sides. Then y = - 1x - 7. This is the equation in slope-intercept form.