$10\mathrm{.}0x+2\mathrm{.}0y-z=27$

$-3\mathrm{.}0x-6\mathrm{.}0y+2\mathrm{.}0z=-61\mathrm{.}5$

$1\mathrm{.}0x+1\mathrm{.}0y+5\mathrm{.}0z=-21\mathrm{.}5$

Given these $3$ linear equations, find the unknowns $\{x,y,z\}$ by using the linsolve function of MatLab. Also employ the Gauss$-$Seidel and Gauss Elimination MatLab functions provided to you to obtain solutions.