{2x-3y=6,3x-y=4解方程组
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{2x-3y=6,3x-y=4解方程组
{2x-3y=6,3x-y=4解方程组
{2x-3y=6,3x-y=4解方程组
2x-3y=6 (1)
3x-y=4 (2)
(1)×3-(2)×2,得
-9y+2y=6×3-4×2
-7y=10
y=-10/7
代入式(2),得
3x+10/7=4
x=6/7
您好:
3x-y=4
y=3x-4
2x-3(3x-4)=6
2x-9x+12=6
9x-2x=12-6
7x=6
x=6/7
y=3x6/7-4=-10/7
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