Question

初一下册数学题：若方程组3x+2y=m和2x-y=2m+1 的解满足x-y=2 求m

N急，麻烦一下！搜头有点紧

Answer 1

x=y+2

3(y+2)+2y=m
既5Y+6=M 2式
2(y+2)-y=2m+1
既Y+3=2M
5Y+15=10M 1式
1式-2式得9M=9 M=1

Answer 2

3x+2y=m
2x-y-1=2m
2x-y-1=2(3x+2y)
2x-y-1=6x+4y
4x+5y=-1
x-y=2
9y=-9
y=-1
x=1
3x+2y=1
m=1

Answer 3

3x+2y=m
2x-y-1=2m
2x-y-1=2(3x+2y)
2x-y-1=6x+4y
4x+5y=-1
x-y=2
9y=-9
y=-1
x=1
3x+2y=1
m=1