To find the slope when given 2 sets of points.
Use the formula: y2-y1/x2-y2
Y2 is 1
y1 is 10
x2 is -15
x1 is 15
1-10/-15-15=
-9/-30
3/10
The answer is not negative because when you divide -/-= a positive answer.
The slope would be -3/10. I got this by
(-15,1)-(15,10)=30, -9
then you put the right number on top for your slope -9/30.
Then you simplfy.
(-9/30)/3=-3/10.
