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The bullet represents a multiplication. You are supposed to do the multiplication before you do the additions.
points : infinite lines : 4 vertices : 4
If you mean points of (4,-1) and (-1, 4) then the slope of the line works out as -1
Points: (6, -4) and (3, 4) Slope: -8/3
Points: (-6, 4) and (3, -4) Slope: -8/9