Find the equation of line AD

The slope of the line passing through two points $(x_1, y_1)$ and $(x_2, y_2)$ is given by:

$$m = \frac{y_2 - y_1}{x_2 - x_1}$$

Once you have the slope $m$, you can use the point-slope form of a linear equation:

$$y - y_1 = m(x - x_1)$$

You can use either point A or point D for $(x_1, y_1)$ in this step.

To express the equation in the common slope-intercept form ($y = mx + b$), rearrange the equation from Step 2:

$$y = mx - mx_1 + y_1$$ $$y = mx + (y_1 - mx_1)$$

Here, $b = y_1 - mx_1$ is the y-intercept.

Without the specific coordinates for points A and D, a numerical equation cannot be provided.