Question

解方程组｛2分之x+y+3分之x-y=6 2(x+y)-12=-4｝

Answer 1

x/2+y+(x-y)/3 = 6.A

2(x+y)-12 = -4.B

由B可知,x+y=4,即 y= 4-x,代入A中可得

x/2+4-x+(2x-4)/3 = 6

整理式子得,(左右同乘6)

3x+24-6x+4x-8 = 36

x = 20

所以,y = -16