If you mean points of (-1, 9) and (5, 21) then the slope works out as 2
Points: (6, -10) and (-15, 15) Slope: (-10-15)/(6--15) = -25/21
If you mean points of (-1, 9) and (5, 21) then the slope of the line works out as 2
Points: (-12, -17) and (21, 5) Slope: 2/3
Points: (2, 1) and (5, 3) Slope: 2/3
If you mean points of (-2, 1) and (-4, -5) then the slope works out as 3
If you mean points of (2, 1) and (8, 5) then the slope works out as 2/3
If you mean points of: (-2, 1) and (3, 5) then the slope works out as 4/5
2
If the points are (2, 1) and (-6, -4) then the slope works out as 5/8
2
In standard arithmetic, 9 + 10 actually equals 19, not 21.