Prove that the points `(5,1),\ (1,-1)a n d\ (11 ,4)` are collinear. Also find the equation of the straight line on which these points lie.

Explanation

To prove that the points \( (5, 1), (1, -1), \) and \( (11, 4) \) are collinear, we will follow these steps:

### Step 1: Find the equation of the line through two points
We will use the points \( (5, 1) \) and \( (1, -1) \) to find the equation of the line.

The formula for the equation of a line given two points \( (x_1, y_1) \) and \( (x_2, y_2) \) is:

\[
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