6. Answer the following questions. a. How can integer programming be used to ensure that the variable x can assume only the values 1, 2, 3, and 4? b. If x and y are both integers, how would you ensure that whenever x 2, then y 3? c. Suppose a cost function c(x) is defined as follows. c(x) = = I 10+ 15x, if 0x2 20+10x, if 2 x 5 How can you state the value of y = c(x) in an integer programming model where 0 x 5? -

6. Answer the following questions. a. How can integer programming be used to ensure that the variable x can assume only the values 1,2,3, and 4 ? b. If x and y are both integers, how would you ensure that whenever x2, then y3 ? c. Suppose a cost function c(x) is defined as follows. c(x)={10+15x,20+10x,if0x2if2x5 How can you state the value of y=c(x) in an integer programuing model where 0x5