Find a point on the line where it touches a gridpoint and start from there. Slope is defined as rise/run, so from that point you either go up or down for rise, and left or right for run to find another point closest where the line touches a gridpoint.
A graph with a slope that looks like \ will be negative and a slope that looks like / will be positive
5. 3/2
6. Undefined
7. 7/2
8. 3/6 simplifes to 1/2
9. -1/3
10. -2/3
Please consider marking brainliest :) I can correct mistakes if needed.