Final answer:
The slope of the line calculated using the points (45, 10) and (49, 5) is -1.25.
Step-by-step explanation:
The slope of a line can be calculated using two points on the line. The formula for calculating the slope (m) is m = (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are coordinates of two distinct points on the line.
Using the given points from the student's question, let's choose two points to find the slope. For example, we can use (45, 10) and (49, 5). Applying the formula, the slope m is calculated as follows:
m = (5 - 10) / (49 - 45) = (-5) / (4) = -1.25
Therefore, the slope of the line that contains these points is -1.25.