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m = (y2 - y1)/(x2 - x1)
P1 (1/2 , 4) x1 = 1/2 y1 = 4
p2( -4, 5) x2 = - 4 y2 = 5
m= ((5 - 4) /(-4 - 1/2)
m = 1 /((-8 - 1)/2)
m = 1/(-9/2)
m = - 2/9
Solucion
m = -2/9