What is the slope of the line that passes through the points \( (2,-6) \) and \( 6,-12) \) ? Write your answer in simplest form.

Step 1 ：\( m = \frac{y_2 - y_1}{x_2 - x_1} \)

Step 2 ：\( m = \frac{-12 - (-6)}{6 - 2} \)

Step 3 ：\( m = \frac{-6}{4} \)

Step 4 ：\( m = -\frac{3}{2} \)