so to find the slope you will have to do
Rise/run
So you have to pick two points on a line (which they have done already) and determine if the slope is positive or negative.
Once you have determined the positive or negative slope then you have to do the rise/run
The rise is how many units you have to count up to the second point and the run is how many points sideways you have to count.
#3 ANSWER:
So the line is positive. Then you have to count up 4 units and over 3 so your answer is
4/3
#4 ANSWER:
The line is negative. And you count up 1 and over 2 so your answer is
1/2
Hope this helps have a good day!! :))))