If $A\left(-1,0\right),$ $B\left(5,-2\right)$ and $C\left(8,2\right)$ are the vertices of a triangle $ABC$, then find the coordinates of its centroid.

If $\left(-2, 1\right)$ is the centroid of the triangle having its vertices at $\left(x, 0\right), \left(5, -2\right), \left(-8, y\right)$, then $x, y$ satisfy the relation

If the centroid of the triangle formed by $(7, x), (y, -6) \text{and} (9, 10)$ is at $(6, 3)$, then $(x, y)=$