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slope = (y2-y1)/(x2-x1)
m = (5-3)/(-1-1)
m=2/-2
m=-1
point slope form
y-y1 = m(x-x1)
y -5 = -1(x-(-1))
y-5 =-1(x+1)
slope intercept form
y-5 =-1 (x+1)
distribute
y-5 = -1x -1
add 5 to each side
y = -x +4