要20道二元一次方程组题和答案

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y=2x-3
3x+2y=8
x=2y=12x-y=5
3x+4y=2
x=2y=-12s+3t=-1
4s-3t=8
s=6/7t=-10/9
2x-3y=7
x-3y=7
x=0y=-3/7
2x+y=5
x-3y=6
x=3y=-1x+3y=7
y-x=1x=1y=2x+y=42x-y=5
x=3y=17x-7y=-11
7x-2y=-12
x=-1y=-13x-5y=6
2x-3y=4
x=2y=0x+1=5(y+2)
3(2x-5)-4(y+4)=5
x=4y=-13y+25=x
4(y-4)=x
x=148y=41x+y+4.2=12.8
2x+1.5y=15
x=5y=33x-2y=10
5x-4y=-130
x=-10y=-206x+7y=-19
6x-5y=17
x=1/3y=-33(x-1)=y+5
5(y-1)=3(x+5)
x=5t=72(x-y)=2y-x+1
0.5x+0.1y=0.08*50
x=7y=52(x+2)-3(y-1)=13
3(x+2)+5(y-1)=30.9
x=6.3y=2.2x+y=m5x-3y=-m
x=m/4y=3/4m
x-2y=-3
3x+y=5
x=1y=2x+2(x+2y)=4
x+2y=2
x=0y=1