Answer:
1) 1/2
2) 2/1
3) -1/2
4) -2/1
Step-by-step explanation:
use two ordered pairs to find slope by using this formula:
difference of y-values over difference of x-values
example:  for problem #1, I used points (0,3) and (2,4)
difference of y-values:  4-3 = 1
difference of x-values:  2-0 = 2
Slope is 1/2