用代入法解 2x-y=6和 2x+3y=-2 2x+3y=15和x-5y=1
用代入法解方程组:y=3(x-y),x=2(x-y)
用代入法解方程组:2x+3y=-1 4x-y=5
用代入法解方程组 {x-y=3 2y+3(x-y)=11}
4X+3Y=5 2x-y=-5用加减法和代入法解
x=2y 3x+y=14 用二元一次方程解,这两题要用代入法 3x-y=1 4x+6y=17
用代入法解此方程组:(x+y)/2+(x-y)/3=6 4(x+y)-5(x-y)=2
用代入法解方程2(x-y)/3-(x+y)/4=-1① 6(x+y)-4(2x-y)=16②
用代入法解下列方程组{x-y-6,2x+3y-8 {3(y-2)=x-17,2(x-1)-5y-8
x\3-y\4=1 x\2+y\3=2 用代入法解
用代入法解方程组:2x=3y 3x=2y+1
3x+4y=2,2x-y=5用代入法解
{2x+5y=-2,x=8-3y用代入法解方程组