elimination method solve for x and y
8x-9y=8.5
7y-2x=-4.5

Question

anonymous · Answer

multipy the second equation by 4 to get 28y -8x = -18. the 8x and the -8x will cancel out and all you have to do is solve the leftover equation.

jhonyy9 · Answer

8x-9y=8,5    for you can eliminat the term x you need multiplie the second  
-2x+7y=-4,5   equation with 4 and hence you will get -8x+28y =-18

than you have    8x-9y=8,5
                      -8x+28y=-18  assum that and you get 
                    -------------------
                       0    19y= -9,5 
                                 y= -9,5/19 = -1/2
- than 8x-9(-1/2)=8,5
           8x+(9/2)=8,5
            8x=8,5-(9/2)=(17-9)/2 =8/2=4
              x=4/8 =1/2
x=1/2
y=-1/2