The general solution of the associated system of equations (part (a)) is:

- x = -50 - s + t

y = 40 - s + t

z = -10 + t

s, t arbitrary (and non-negative).

The change of shopper shopper traffic if you move is

- traffic at new location - traffic at old location =
y - x = 90 shoppers per minute,

so move, since the new location will enjoy passing traffic of 90 more shoppers per minute.

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