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x-y= 7
x(kwadrat)- y(kwadrat)= 77
x=7+y
(7+y)do kwadratu - y(kwadrat)=77
49+y(kwadrat) + y(kwadrat)=77
2y(kwadrat)=28/2
y=14
x+14=7
x=-7
x=7
y=14
Zad.2
x+y+z=9
x(kw.)-y(kw)-z(kw)=27
...dalej jeszcze to rozwiązuje , narazie masz tyle xD