Final answer:
To calculate the slope between two points on a straight line, use the rise over run formula. Determine the change in the y-values and the change in the x-values between the two points, and then divide the rise by the run. For example, the slope between the points (4,000m) and (6,000m) is 1,000m per meter.
Step-by-step explanation:
The slope between two points on a straight line can be calculated using the rise over run formula. To calculate the slope, you need to designate one point as the starting point and the other point as the end point. Then, determine the change in the y-values (rise) and the change in the x-values (run) between the two points. Divide the rise by the run to find the slope.
For example, let's calculate the slope between the points (4,000m) and (6,000m) on the air density graph. The change in y-values (rise) is 6,000 - 4,000 = 2,000m, and the change in x-values (run) is 6 - 4 = 2. Therefore, the slope is 2,000m / 2 = 1,000m per meter.