[5x-6y=9 [7x-4y=-5
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[5x-6y=9 [7x-4y=-5
[5x-6y=9 [7x-4y=-5
[5x-6y=9 [7x-4y=-5
5x-6y=9 (1)
7x-4y=-5 (2)
(2)×3-(1)×2
21x-12y-10x+12y=-15-18
11x=-33
x=-3
代入(1)
15-6y=9
6y=6
y=1
所以x=-3,y=1
5x-6y=9 (1)
7x-4y=-5 (2)
(2)×3-(1)×2
21x-12y-10x+12y=-15-18
11x=-33
x=-3
代入(1)
15-6y=9
6y=6
y=1
所以x=-3,y=1
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