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{5x%6y=9 7x%4y=%5

{5x-6y=9,① 7x-4y=-5.② 解:①×2,得 10x-12y=18,③ ②×3,

(1)5x-6y=9两边×4得(3)20x-24y=36 (2)7x-4y=5两边×6得(

①×2:10x-12y=18③ ②×3:21x-12y=-15④ ④-③:11x=-33

1.y=x+37x+5y=9 解:依题意,得 y=9 将y=9代入原式,得 x+37x+5*

7x-4y=13,5x-6y=3 21x-12y=39,10x-12y=6 所以12y=21x-

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