Use the method of elimination to solve the system $$\begin{array}{r@{\,}c@{\,}r} -3 x+ 3 y &=& 9, \cr 4 x+ 3 y &=& -5. \cr \end{array}$$
Answer:

Note: If there is more than one point, type the points as a comma separated list (e.g.: (1,2),(3,4)). If the system has no solutions, enter None.