Find the equation of the side BC of the triangle ABC whose vertices are A (-1, -2), B (0, 1) and C (2, 0) respectively. Also, find the equation of the median through A (-1, -2).
Find the equation of the side BC of the triangle ABC whose vertices are A (-1, -2), B (0, 1) and C (2, 0) respectively. Also, find the equation of the median through A (-1, -2).

Given:

The vertices of triangle ABC are:

    \[A\text{ }\left( -1,\text{ }-2 \right),\text{ }B\left( 0,\text{ }1 \right)\text{ }and\text{ }C\left( 2,\text{ }0 \right).\]

Let us find the equation of median through A.

Hence, equation of BC is

On using the formula,

    \[x\text{ }+\text{ }2y\text{ }\text{ }2\text{ }=\text{ }0\]

Let D be the midpoint of median AD,

    \[4y\text{ }+\text{ }8\text{ }=\text{ }5x\text{ }+\text{ }5\]

    \[5x\text{ }\text{ }4y\text{ }\text{ }3\text{ }=\text{ }0\]

∴ The equation of line BC is:

    \[x\text{ }+\text{ }2y\text{ }\text{ }-2\text{ }=\text{ }0\]

The equation of median is:

    \[~5x\text{ }\text{ }-4y\text{ }\text{ }-3\text{ }=\text{ }0\]