8. A locus \(C _ { 1 }\) is defined by \(C _ { 1 } = \{ z : | z + \mathrm { i } | \leq | z - 2 | \}\).
- Indicate by shading on the Argand diagram below the region representing \(C _ { 1 }\).
\includegraphics[max width=\textwidth, alt={}, center]{b073ed4d-319a-4b97-8ff1-59d66aa22f24-18_883_940_408_317} - Find the cartesian equation of the boundary line of the region representing \(C _ { 1 }\), giving your answer in the form \(a x + b y + c = 0\).
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