5x2 y2 61 15 x 2 3y2 61x July 8, 2019 16 32 64 128 5x2 + y2=61 15x2+3y2=61x 35.2. 1) (1 1x2 - 6y)2- (1 1x2 - 6y)(1 1x2 + 6y)