Write code and solve in Matlab

Write a code that solves the following problems and prints the results to the command window

a$.$

$3u+z=15$

$u+2z=10$

b$.$

$2a+2x=18$

$a+3x=17$

Systems of $3$ equations with $3$ unknowns

Write a code that solves the following problems and prints the results to the command window

a$.$

$-3c-4u+4y=-25$

$-3c+3u+3y=6$

$-4c-3y=13$

b$.$

$3c+5v+4z=6$

$-2c-5v-4z=-5$

$-6c+2v+4z=0$