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V1*t = V2*t + 2. 50*t = 20*t + 2. 30t = 2. t = 0.06666 h = 4 Min.
(9,-4), m = 1/3. Y = mx + b = -4, (1/3)9 + b = -4, b = -7. Eq: Y = 1/3)x - 7.
(4,-2,5), (x,y,z), (6,4,-3). x-4 = (6-4)/2 = 1, X = 5. y-(-2) = (4-(-2))/2 = 3, Y = 1. z-5 = (-3-5)/2 = -4, Z = 1.
