Jawabanmu

2014-09-06T19:49:55+07:00
2x+3y-4x-5y = 2x-4x+3y-5y= -2x-2y
2014-09-06T19:51:32+07:00
2x+3y-4x-5y =
samakan variabel nya
( 2x - 4x ) = -2x
( 3y - 5y ) = -2y
maka hasilnya
-2x -2y
1 4 1