Answers are
1. 5/2
2. 1/2
3. - 1/2
4. - 4/3
Step by step
Using the graph you can count rise (change in y) over run (change in x)
See attached example - I do this on my phone so drawing lines is hard
Remember that when you have a negative slope or line, it will go downwards from left to right.
You can also find slope by slope formula
y2 - y1 over x2 - x1
You would find your two coordinates and subtract. Change in Y over change in x for slope.