作业帮3x+2y=36=5x+2y=72怎么算?
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3x+2y=36=5x+2y=72怎么算?
3x+2y=36=5x+2y=72怎么算?
3x+2y=36=5x+2y=72怎么算?
3x+2y=36 【1】
5x+2y=72 【2】
【2】-【1】 得2x=36 x=18
代入【1】得 y=-9
由3x+2y=36（1）可知
6x+4y=72=5x+2y
所以 x=-2y代入（1）可得
-6y+2y=36 所以 y=-9 所以 x=18
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