How do we go about figuring this question? Could you briefly explain?

Consider the following table describing the joint distribution of two discrete variables, X and Y, where X takes on 2 possible values x1 and x2, and Y takes on 2 possible values y1 and y2. Y y1 y2 x1 0.04 0.02 X X2 0.05 0.89 Are X and Y independent? Explain