Answer:
The slope is 4
Explanation:
basilly you add easy x(-1,-7) + y(3,9) = 2/2
make sure that you add x left and y right first -1+3=2 and then -7+9=2 equal=2,2 together and just add both equal 4
Most easy just put you answer in a graht and count the squares
hope this helps ;)