3x+2y=7 4x-y=13
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3x+2y=74x-y=133x+2y=74x-y=133x+2y=74x-y=13由式(2)得,y=4x-13,代入时1得3x+2(4x-13)=7解得x=3代入y=4x-13,得y=-14x-y=
3x+2y=7 4x-y=13
3x+2y=7 4x-y=13
3x+2y=7 4x-y=13
由式(2)得,y=4x-13,代入时1得
3x+2(4x-13)=7
解得x=3
代入y=4x-13,得
y=-1
4x-y=13
y=4x-13
3x+2(4x-13)=7
3x+8x-26=7
11x=7+26
11x=33
x=3
y=4x3-13=-1
3x+2y=7
4x-y=13
y=4x-13
代入3x+2(4x-13)=7
3x+8x-26=7
11x=33
得x=3
y=4x3-13
得y=1
初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x
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