Show that the line joining the points `(4,5)` and `(1,2)` is parallel to the line joining the points `(9,-2)` and `(12,1)`.

Explanation

To show that the line joining the points (4, 5) and (1, 2) is parallel to the line joining the points (9, -2) and (12, 1), we need to find the slopes of both lines and compare them. If the slopes are equal, then the lines are parallel.

### Step 1: Find the slope of the first line (m1)
The formula for the slope (m) between two points \((x_1, y_1)\) and \((x_2, y_2)\) is given by:

\[ m = \frac{y_2 - y_1}{x_2 - x_1} \]
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