The pair of equations $x=0$ and $y=0$ has

If the graph of two lines passes through the same points, then the system of equations representing these lines is

If $x=a, y=b$ is the solution of the equations$x-y=2$ and $x+y=4$, then the values of $a$ and $b$ are, respectively

Graphically, the pair of equations represents two lines which are:

$6x-3y+10=0$
$2x-y+9=0$