Explanation:
1. we can find the slope of the line using this formula:

y2, y1, x2, x1 are constants from the two coordinates given, so we just plug them into the formula

now we evaluate on both ends of the fraction

simplify

the slope is 8
2. we are given a graph which means we can simply count the slope
the slope means:

which is the change in y over the change in x , this means that we can start at a coordinate and count the slope
using this method, we get a slope of 2
3. the slope is the change in y over the change in x. the y values are decreasing by -8 while the x values are increasing by ones
this means our slope is

4. we just have to use the aforementioned slope formula above

evaluate

simplify

the slope is -2