John and his wife are saving money for a vacation. john looks at his bank account and see that he has $221.37. his wife on a shopping spree in her account is overdrawn $57.13 what is the difference in their bank accounts?

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints