A solution is feasible if it satisfies

a$.$ all constraints

b$.$ at least one constraint

Answer Questions $2,3,4-1$ and $4-2$ according to the linear program below:

Max $7x_1+5x_2$

$S.T.3\mathrm{.}5x_1+2x_{2}80$

$,0\mathrm{.}6x_1+0\mathrm{.}5x_{2}10$

$,x_1,x_{2}0$

Calculate the objective function value if $)=8,x_2=(4.$

Is solution $)=10,x_2=(10$ feasible for this linear program?

Solve this linear program by using Excel Solver.

$(4-1)$ The optimal solution is : $x_1=x_2=$

$(4-2)$ The optimal objective function value is: $$