Question $9$

For the given objective function which of the following

combinations of constraints would produce multiple optimal

solutions?

MaxZ$=10x_1+6x_2$

$x_1+x_{2}15$ and $x_1-x_{2}10$

$3x_1+5x_{2}30$ and $x_{1}1$ and $x_{2}2$

$x_{1}10$ and $x_{2}20$

$5x_1+3x_{2}15$ and $x_1+x_{2}10$

None of the above.