Consider the following linear program $($LP$)$:

Maxz$=-3^{**}x+4^{**}y$

subject $to$

$-x+y1$

$2**x-y2$

$x+y4$

$x,y0$

Which of the following are true?

Note: For these problems the LP is similar except the constraints may change from "greater$-$than$-$or$-$equal to$"$ to "less$-$than$-$or$-$equal to$"$ or vice versa. For each problem, check your constraints and the feasible region carefully.