Verified Answer :

sadeswilson

perpendicular, because their slopes are negative reciprocals.

texaschic101

Line BC :
(4,-5)(3,2)
slope = (2 - (-5) / (3 - 4) = (2 + 5)/ -1 = -7

Line DE:
(2,0)(9,1)
slope = (1-0) / (9 - 2) = 1/7

these are negative reciprocal slopes and therefore, perpendicular lines

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