2x-3y+1=0,(1)
x+6y-4=0 (2)
(1)*2+(2):5x=2,x=2/5
(2)*2-(1):15y=9,y=3/5亲，还有题目哦若方程{mx+(m-1)y=3,4x+3y=7的解x和y的值相等,则m=2x=y, 4x+3y=7, x=1=ym+(m-1)=3,2m=4, m=2若不等式{2x-a<0,3-5x<-2,无解,则a的取值范围是2x-a<0, 3-5x<-2 2x1无解∴ a/2≤1, a≤2