So if you look at the equation you can see the y-intercept. slope y-intercept ↓ ↓ y = x - 2
The y-intercept is where the line crosses the y-axis. So which ever graph has -2 as the y-intercept in correct...Its more complex when the graphs have the same intercept but in this case this should be easy to find. So looking at the graphs you can see that the 3rd graph is the correct answer. I hope this helps love! :)