Question

1 .Sa se afle perechile de numere naturale (x,y), stiind ca :a) x*y=5 b) (x+1)*y=4 c)(x+1)*(y-1)=7, d) xy+x=3,e) xy-x=5,f) 2xy+6y=8, g) (x+2)*(y-3)=12
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Answer 1

a) (1, 5), (5, 1);
b) (3, 1), (1, 2), (0, 4);
c) (0, 8), (6, 2);
d) xy+x=x*(y+1) => (1, 2), (3, 0);
e) xy-x=x(y-1) => (1, 6), (5, 2);
f) 2xy+6y = 2y(x+3) => (-2, 4), (5, 1/2), (-1, 2), (1, 1);
g)x+2 =1, 2, 3, 4, 6, 12 => x= -1, 0, 1, 2, 4, 10
  y-3= 12, 6, 4, 3, 2, 1 => y= 15, 9, 7, 6, 5, 4
  (-1, 15), (0, 9), (1, 7), (2, 6), (4, 5), (10, 4).