Ответы и объяснения

2014-01-08T17:09:10+00:00
2014-01-08T17:09:16+00:00
3x-y = -5
-5x+2y = 1

3x+5 = y
-5x+2y = 1

-5x+2(3x+5) = 1
-5x+6x+10 = 1
x+10 = 1

x = -9
y = -22