Answer:
The slope of #7 is 2 an the slope of #8 is -3. 
Explanation:
In order to find the slope, you can use the slope formula. 
m (slope) = (y1 - y2)/(x1 - x2)
Then you can use any two points in order to solve. 
#7
m (slope) = (y1 - y2)/(x1 - x2)
m (slope) = (3 - -3)/(2 - -1)
m (slope) = 6/3
m (slope) = 2
#8
m (slope) = (y1 - y2)/(x1 - x2)
m (slope) = (4 - 7)/(-1 - -2)
m (slope) = -3/1
m (slope) = -3