Linear equations in two variables .
Fill in the blanks 
1)linear equation in 2 variable has _________ solution .
2)a system of 2 linear equation in x and y has no solution if the two graph lines are ________.
3) the graph of equations ax by c is always a ____________.
4) there is no solution of 2 linear equation 6x -2y=3  and kx-y =2 has uniqe solution then k _________.
5)for system of linear equation of a1 upon a2 =b1 upon b2 =c1 upon c2  there is /are _________ solution .
6) there is no solution of 2 linear equation a1x b1x c1=0 and a2x b2x c2 =0 if _________.
7)the graph of x=0 is_________.
8) the  graph of y=1 is a line parallel to ________.