Question

помогитi плизз.........

Answer 1

{2x+(x-y)/4=11

{3y-(x-y)/3=1

{8x+x-y=44

{9y-x+y=3

{9x-y=44    

{-x+10y=3      ⇒x=10y-3

9(10y-3)-y=44

90y-27-y=44

89y=44+27=71

y=71/89

x=10*71/89-3=443/89=4 87/89

ответ (443/89;71/89)

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5x-(x-y)/5=11

2y-(x+y)/3=11

25x-x+y=55

6y-x-y=33

24x+y=55

5y-x=33       ⇒ x=5y-33

24(5y-33)+y=55

120y-792+y=55

121y=847

y=847/121=7

x=5*7-33=35-33=2

ответ (2;7)