Solve the system using addition/elimination method. If there is exactly one solution, write as an ordered pair. Otherwise, choose one of the other options.

{4x4y=46x6y=9\displaystyle {\left\lbrace\begin{array}{ccccc} {4}{x}&-&{4}{y}&=&-{4}\\{6}{x}&-&{6}{y}&=&-{9}\end{array}\right.}