The vertices of `DeltaPQR` are `P(2, 1)`, `Q(-2, 3)`, `R(4, 5)`. Find equation of the median through the vertex `R`.

Explanation

To find the equation of the median through the vertex \( R \) of triangle \( PQR \) with vertices \( P(2, 1) \), \( Q(-2, 3) \), and \( R(4, 5) \), we will follow these steps:

### Step 1: Find the midpoint \( O \) of side \( PQ \)

The coordinates of point \( O \), the midpoint of line segment \( PQ \), can be calculated using the midpoint formula:
\[ O\left(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}\right) \]
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