怎么解下列方程组?(1).X=Y+1Y+X=5(2)2X-3Y=41/2Y-X=1(3)X+2=3Y2X=3Y(4)3X+7=75X-2Y=8
(5)2X+3Y=54X-Y=3(6)3X-2Y=45X+3Y-13=0(7)X+5Y=122X-5Y=-6(8)X-3Y=-33X+Y=11(要写过程)