For both questions, all you really have to do is choose 2 exact points on each graph, and use those to find the slope. Thankfully, it already has 2 plots on there for us, so all we have to do is plug in the values in the equation below :)
Slope equation : y₂-y₁ / x₂-x₁
1) (1,2), (-2,-4)
-4 -2 / -2 -2
-6 / -4
Simplify.
The slope of number one is 3/2
2) (-2,2), (6,-4)
-4 -2 / 6 + 2
-6 / 8
Simplify.
The slope for question 2 is -3/4
~Hope I helped!~