book Maths Puzzle Numerical Ability

This is a tough one.

3y^2+4xy-9x^2=-1

A. Solve for X in terms of Y B. Solve for Y in terms of X

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book Other Question

If the angle of CTA and the angle of DTA form a linear pair and the angle of CTA is acute and then the angle of DTA is what kind of angle? sloving equations for an example -1.6r+5=-7.8