Respuesta :

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slope formula : (y2 - y1) / (x2 - x1)
(-2,1)....x1 = -2 and y1 = 1
(4,-1)...x2 = 4 and y2 = -1
slope = (-1 - 1) / (4 - (-2) = -2/6 = - 1/3 <==