i need help with these two graphs. you have to determine the slope and it would be helpful if anyone could show how they solved them

Answer:
a.-1
b.2/4
Step-by-step explanation: "rise over run"/vertical ( l ) over horizontal ( -- )
Answer:
First Graph: 1
Second Graph: 1/2
Step-by-step explanation:
Rise over run
Look at where the line intersects with the other line perfectly and find the two closest times when that happens, then go up and over and count it.
So for the first one it is: up 1 over 1. That as a fraction is, 1/1 and that equals 1. So the slope is 1.
For the second one it is up 1 over 2. That as a fraction is 1/2. So the slope is 1/2.
Hope this helps :)