Which of the following is the angle between the lines x =0 and ax+by+c=0?

The angle between the lines y=0 and ax+by +c=0 is -

Find the angle between the lines x=a and by+c=0 .

The angle between the line x = a and by+c= 0 , is

Find the acute angle between lines x + y = 0 and y = 0

Find the distance between the parallel lines ax+by+c=0 and ax+by+d=0

Find the distance between the parallel lines ax+by+c=0 and ax+by+d=0

Which of the following is the slope of any line parallel to the line ax+by+c=0 (bne0) ?

Find the condition in a,b such that the portion of the line ax+by=1, intercepted between the lines ax+y=0 and x + by=0 sustains a right angle at origin.

Find the angle between the straight lines : ax+by+c=0andbx-ay+c_(1)=0