a) |3x-4|+|3y-5|=0
=> \left\{\begin{matrix} |3x-4| = 0 & & \\ |3y-5| = 0 & & \end{matrix}\right.
=> \left\{\begin{matrix} 3x-4 = 0 & & \\ 3y-5 = 0 & & \end{matrix}\right.
=>\left\{\begin{matrix} 3x = 4 & & \\ 3y = 5 & & \end{matrix}\right.
=> \left\{\begin{matrix} x = \frac{4}{3} & & \\ y =...