If the points `P(1,5)`, `Q(-1,1)` and `R(4,y)` are collinear, find the value of `y`.

Explanation

To determine the value of \( y \) such that the points \( P(1,5) \), \( Q(-1,1) \), and \( R(4,y) \) are collinear, we can follow these steps:

### Step 1: Find the slope of line segment \( PQ \)

The formula for the slope between two points \( (x_1, y_1) \) and \( (x_2, y_2) \) is given by:

\[
\text{slope} = \frac{y_2 - y_1}{x_2 - x_1}
...