In the following figure, what are the coordinates of origin?

Based on the above Cartesian plane:

If the coordinates of point $A$ is of the form $\left(x, y\right)$, then the value of $x+y=$_____.

Based on the above Cartesian planes:

The co-ordinates of point $\mathrm{B}$ are _____.

Based on the Cartesian plane:

If the co-ordinate of the point $C$ is $\left(k,0\right)$, then the value of $k$ is _____.

Based on the above Cartesian plane:

The co-ordinates of the point $\mathrm{E}$ are $($_____$, -2)$.

Based on the above Cartesian plane, if the co-ordinates of point $\mathrm{F}$ is $\left(a,b\right)$ then the value of $a=$ _____.

Based on the above Cartesian plane, the co-ordinates of point $\mathrm{G}$ are $(2$, _____$)$.