It’s 3/5 that is due to the saying rise over one. What you do is count the numbers along the x axis until you reach a point where the line is going through perfectly and proceed to do the same for the y axis. As you can see it is 3 squares up and 5 squares out. Going up or down is the x axis/ “rise” and going side to side is the y axis or “the run”. If this wasn’t helpful I would recommend watching a video on how to find the slope of a line it’s easier to understand with a visual.