Final answer:
The equation of the direct variation containing the point (-2, 10) is y = -5x, where -5 is the constant of variation determined by the given point.
Step-by-step explanation:
The equation of the direct variation that contains the point (-2, 10) can be found using the formula y = kx, where k is the constant of variation. Since the point (-2, 10) lies on the line, we can substitute these values into the equation to find k: 10 = k(-2). Solving for k, we get k = -5. Therefore, the equation of the direct variation is y = -5x.