On comparing the ratios α1/α2 and b1/b2 and c1/c2 find out whether the lines representing the following pair of linear equations intersect at a point, are parallel or coincident: (7 to 9).
(7.) 5x-4y+8 =0
7x+6y-9=0
(8.) 9x+3y+12 =0
18x+6y+24=0
(9.) 6x-3y+10=0
2x-y+9=0