Решить систему 7u+2v=1 17u+6v=-9

7u+2v=1         /.(-3) 17u+6v=-9 --- -21u-6u=-3 17u+6v=-9   /+ --- -4u=-12, u=3 --- 2v=1-7u=1-7.3=1-21=-20 v=-10 --- /u,v/=/3,-10/ =========