To find the slope of a line passing through two points, we can use the formula:
slope = (change in y)/(change in x)
Using the points (1, 3) and (5, 8), we can calculate the change in y and change in x:
change in y = 8 - 3 = 5
change in x = 5 - 1 = 4
Now, we can substitute these values into the formula:
slope = 5/4
So, the slope of the line passing through the points (1, 3) and (5, 8) is 5/4.