Concurrent Lines

The straight line $x+2y-9=0,3x+5y-5=0$ and $ax+by-1=0$ are concurrent if the straight line $35x-22y+1=0$ passes through the point

If the lines $x+2ay+a=0, x+3by+b=0$ and $x+4cy+c=0$ are concurrent, then $a, b$ and $c$ are in

The line $ax+by+c=0$, where $3a+2b+4c=0$ is concurrent at the point