If A = [(x, y) : x2 + y2 = 25] and B = [(x, y) : x2 + 9y2 = 144], then A ∩ B contains _______ points.
A = Set of all values (x, y) : x2 + y2 = 25 = 52
B = [x2 / 144] + [y2 / 16] = 1
i.e., [x2 / (12)2] + [y2 / (4)2] = 1.
Clearly, A ∩ B consists of four points
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