Find the separate equations of the lines represented by :
(1) `3x^(2) -7xy + 4y^(2) = 0`
(2) `6x^(2) - 5xy - 6y^(2) = 0`
(3) `2x^(2) + 2xy - y^(2) = 0`
(4) `x^(2) - y^(2) + x + y = 0.`

Explanation

(1) `x -y = 0, 3x -4y = 0`
(2) `2x - 3y = 0, 3x + 2y = 0`
(3) `(1+sqrt(3)) x -y = 0, (1-sqrt(3)) x -y = 0`
(4) `x + y = 0, x - y + 1 = 0` .