Final answer:
The slope of the line that passes through the points (6, -12) and (15, -3) is calculated as 1 using the slope formula.
Step-by-step explanation:
To calculate the slope of a line that passes through two points, you can use the slope formula which is m = (y2 - y1) / (x2 - x1), where m represents the slope, and (x1, y1) and (x2, y2) are the coordinates of the two points the line passes through.
For the points given, (6, -12) and (15, -3), the calculation would look like this:
m = (-3 - (-12)) / (15 - 6) = 9 / 9 = 1
Therefore, the slope of the line that passes through the points (6, -12) and (15, -3) is 1.