Answer is - 8/5 slope
Step by step
See attachment
You can find the change in y over change in x
By subtracting the x values, one from the other, the rate is consistent 5.
By subtracting the y values, one from the other, the rate is consistent -8
Slope is y/x so -8/5.
You can also chose two pairs of coordinates and find change in y over change in x.
(-7, 9)
(-2,1)
1 - 9 over -2 - -7
-8/5 slope