Respostas

2014-03-26T17:22:58-03:00
70 x 30y= 170
-5x-2y=8

70x + 5x=170
-2y-30y=8

75x= 170
-32y=8

x= 170÷75
y=- 8÷32

x=2,26
y=-0.25
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