Question 1207773
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There are two basic approaches. 


One approach is to use the slope formula. 
m = (y2-y1)/(x2-x1)
m = (-8-(-9))/(-10-(-6))
m = (-8+9)/(-10+6)
m = 1/(-4)
m = <font color=red>-1/4</font>
Notice we subtract y coordinates up top, and subtract x coordinates down below. 
Be sure not to mix up the order of x1 and x2 for instance, or else you might get an erroneous positive result.



Another approach would be to plot the two points. 
Start at the left-most point (-10,-8). 
Then move down 1, and right 4 to arrive at (-6,-9)
rise = -1 = means go down 1
run = 4 = go right 4
slope = rise/run = <font color=red>-1/4</font>
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