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steep/less steep
larger slope, smaller slope
negative reciprocal
m1×m2 = -1 OR m2 = -1/m1
slope
m= vertical/horizontal=rise/run
slope formula
y2-y2/x2-x1
parallel
m1=m2
《——》
m = 0
arrow pointing up and down
no slope, undefined
Note 
Flashcard (90)