The distance of point $P(2, -3)$ from the $X$-axis is $\ldots \ldots \ldots \ldots .$.

The vertices of $\Delta ABC$ are $A(a, 6)$, $B(5, 1)$, and $C(4, 6)$. If the circumcentre of the triangle is $P(2, 3)$, find the value of $a$.

Find the centroid of the triangle with vertices $(1,2), (3,3)$ and $(5,1)$.

State whether the following statement is true or false. Justify your answer.
Points $A(-6, 10)$,$B(-4, 6)$,and $C(3, -8)$ are collinear such that $AB = \frac{2}{9} AC$.

If $A(-2, 1)$,$B(1, 0)$,$C(x, 3)$,and $D(1, y)$ are the vertices of a parallelogram $ABCD$,then find the values of $x$ and $y$.

Find the points of trisection of the line segment joining $(-2,-1)$ and $(7,8)$.