5x-4y＝5
2x+y＝30
у=30-2х
5х-120+8х=5
13х=125
х=9 8/13
у=30-2*9 8/13=30-18 16/13=30-19 3/13=10 10/13
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5x-4y＝5
2x+y＝30
у=30-2х
5х-120+8х=5
13х=125
х=9 8/13
у=30-2*9 8/13=30-18 16/13=30-19 3/13=10 10/13