Find the solutions to the pair of equations
	(x + y)(x - 3)(y - 5) = 0 
and
	(x^2 -1)(y - 35) = 0

answer:  (1, -1), (-1, 1), (1, 5), (-1, 5), (3, 35), (-35, 35)

Here are the cases in detail.
        | x = -y  | x = 3  | y = 5 
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 x =  1 | (1, -1) | none   | (1, 5)
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 x = -1 | (-1, 1) | none   | (-1, 5)
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 y = 35 |(-35, 35)| (3, 35)| none