see,u have y+5x=6 ( =multiplication sign)
and x=-1,0,1
so ,u have to do is substitute x with numbers u have
so,for -1,u have y+5-1=6
=y= 5+6= 11 ( u multiply 5 by -1 u get -5 but when u change the sides u get it as 5 ...so 5 + 6 =11)
(2)y+50=6
=y=6-0=6
(3)y +51=6
y=6 -5=1
( i hope this helped :) )