slope: -7
To find the slope of a line, take 2 points from the line and plug it into this formula, y2-y1/x2-x1.
So,
x1= 39
y1= 36
x2= 40
y2= 29
29-36/40-39
Now simplify.
29-36/40-39
-7/1
-7
And there you have it! The slope of your line is -7.
Hope this helps!
Let me know if you need anything else :)