{ x + y = 4{ x² - y² = 32{ x = 4 - y{ x² - y² = 32(4 - y)² - y² = 32y = -2x = 4 - ( -2 )x = 6(x. y) = (6, -2 ){ 6 + ( -2 ) = 4{ 6² - ( -2 )² = 32{ 4 = 4{ 32 = 32(x, y) = (6, -2 )