If $z=x+i y$ and if the point $\mathrm{P}$ in the Argand plane represents $z$, then the locus of…
If $z=x+i y$ and if the point $\mathrm{P}$ in the Argand plane represents $z$, then the locus of $\mathrm{P}$ satisfying the equation $|z-3 i|+|z+3 i|=10$ is