Consider the following LP:

max z $3$x$1$ x$2$

s$.$t$.4$x$1$ x$27$

s$.$t$.5$x$12$x$210$

s$.$t$.52$x$1,$ x$20$

The optimal solution to this LP is z

$1$

$3$

$7$

$,$ x$1$

$4$

$3$

$,$ x$2$

$5$

$3$

$.$

Use the graphical approach to determine the range of values

for the right$-$hand side of the second constraint for which

the current basis remains optimal.