Question

解方程组2(x-1)-3(y+2)=4,1/2(x+1)-1/3(2y+5)=1

Answer 1

2(x-1)-3(y+2)=4

1/2(x+1)-1/3(2y+5)=1

2x-2-3y-6=4

3(x+1)-2(2y+5)=6

2x-3y=12 ①

3x-4y=13 ②

②-①得x-y=1 ③

③*2-①得

y=-10

x=y+1=-9

所以x=-9,y=-10