Find the combined equation of the pair of lines through the origin and perpendicular to the lines represented by :
(1) `5x^(2) - 8xy + 3y^(2) = 0`
(2) `x^(2) + 4xy - 5y^(2) = 0`
(3) `ax^(2) + 2hxy + by^(2) = 0`.

Explanation

(1) `3x^(2) + 8xy + 5y^(2) = 0`
(2) `5x^(2) + 4xy - y^(2) = 0`
(3) `bx^(2) - 2hxy + ay^(2) = 0`.