Final answer:
The slope of the line that contains the given points is approximately 0.0005954.
Step-by-step explanation:
The slope of a line can be determined using two points on the line.
Let's take the points (x1, y1) = (151515, -10) and (x2, y2) = (212121, 26).
The formula to calculate slope is m = (y2 - y1) / (x2 - x1).
Substituting the values, we get m = (26 - (-10)) / (212121 - 151515) = 36 / 60506 &#approx; 0.0005954.