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x^2+xy=3 .....(I)
xy+y^2=-2 .....(II)
(1). x^2-y^2 = (I) - (II) = 5
(2). x^2+4xy+3y^2 = (I) + 3*(II) = 3 + 3*(-2) = -3
(3). 2x^2-xy-3y^2 = 2*(I) - 3*(II) = 2*3 - 3*(-2) = 12
xy+y^2=-2 .....(II)
(1). x^2-y^2 = (I) - (II) = 5
(2). x^2+4xy+3y^2 = (I) + 3*(II) = 3 + 3*(-2) = -3
(3). 2x^2-xy-3y^2 = 2*(I) - 3*(II) = 2*3 - 3*(-2) = 12
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