The slope of a line passing through two points (x1, y1) and (x2, y2) can be calculated using the formula:
slope = (y2 - y1) / (x2 - x1)
Using the given points (2, 4) and (3, 8):
slope = (8 - 4) / (3 - 2)
slope = 4 / 1
slope = 4
Therefore, the slope of the line that passes through the points (2, 4) and (3, 8) is 4.