solve by elimination method
9x-9y=27
7y-3x=-11

Question

anonymous · Answer

time (3) u get : 21y-9x =-33 ,  -9x+21y=-33
                         9x-9y=27 
                     -9x+21y=-33
         Add :    -------------
                            12y =-6
                                y= -6/12
                                y =-1/2
 Sutitution y=      -1/2 solve for x
                  9x-9(-1/2)=27
                       9x+9/2= 27
                              9x=27-(9/2)
                                x=(45/2)/9
                                x=45/18
                                x=5/2

anonymous · Answer

nancy thanks but the answer is (2.5,-0.5)

anonymous · Answer

yes the same
-1/2=-0.5
5/2=2.5

anonymous · Answer

Ty