Construct the system equations $($system stiffness matrix and the external force column$)$ using the gather and scatter matrices. Modulus of Elasticity and cross$-$sectional area of the members are identical and given as $E=1000\mathrm{.}0$MPa and $A=100\mathrm{.}0m{m}^2,$ respectively.Modulus of Elasticity and cross$-$sectional area of the members are identical and given as $E=1000\mathrm{.}0$MPa and $A=100\mathrm{.}0m{m}^2,$ respectively.