-13.7-(-x)=-49; 6.1-(-y)=-5.2 -2.9+(-x)=-3.8 x+(-0.35)=2.3 -23.5+(-y)=-4.6 y+(-48.3)=-78.5
1)(-х)=-49-13.7 (-х)=-62.7 2)(-у)=-3.8+6.1=2.3 3)(-х)=-3.8-2.9=- 4)х=2.3-4,6= 5)у=-78,5-48.3=