Question

Помогите решить плз\

Answer 1

$l:; ; frac{x-1}{1} =frac{y+1}{2} = frac{z+1}{-1} ; ,; ; M(2,0,1)in alpha ,; ; lin alpha \\M_0(1,-1,-1)in l; ,; ; vec {s}=(1,2,-1)in alpha \\overline {M_0M}=(1,1,2)in alpha \\vec {n_{ alpha }}= left|begin{array}{ccc}i&j&k\1&2&-1\1&1&2end{array}right| =i(4+1)-j(2+1)+k(1-2)=5i-3i-k\\ alpha :; ; 5(x-2)-3(y-0)-(z-1)=0\\ alpha :; ; ; underline {5x-3y-z-9=0}$