For a pair of linear equations: a1x+b1y=c1 and a2x+b2y=c2 If a1a2 = b1b2 = c1c2, then the pair of equations have ______ solution(s).
Unique point is obtained for the pair of equations a1x + b1y + c1 = 0 and a2x +b2y + c2 = 0 if __________ .
Parallel lines are obtained for the pair of equations a1x+b1y+c1=0 and a2x+b2y+c2=0 if
The condition for a pair of equations a1x+b1y+c1=0 and a2x+b2y+c2=0 to be parallel is