Question 826154: tell weather the line through the given points are parallel, perpendicular,or neither. Justify your answer.
#1. line 1: (-3,1),(-7,-2) line 2: (2,-1),(8,4)
Answer by josgarithmetic(39620)   (Show Source):
You can put this solution on YOUR website! Formula for Slope, m, for line through points (h,k) and (u,v):  .
Calculate the slope for each pair of points.
If they are equal, then lines are parallel;
if they are negative reciprocals, then lines are perpendicular.
If slopes not equal and not negative reciprocals, then lines are at angles other than 90 degrees and other than 0 degrees to each other.
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