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Unformatted text preview: d d + 300 = 400 + a Since the streets are one-way, we have additional restrictions: a , b , c , d . The solution has one free parameter, r: a =-100 + r b = 250-r c = 20 + r d = r The inequalities are all satised as long as r 100 and r 250. Plug this in to get the ranges of a , b , c and d : a 150 b 100 120 c 270 100 d 250 . 1...
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- Spring '11