1.x-2y+13=52 rezulta x-2y=39
[tex]3x-6y+1= 3(x-2y) +1=3*39+1=117+1=118[/tex]
2. numarul 8 p;oate fi scris ca> 6+2 sau 7+1 sau 5+3
3. cautam 2 numere astfel incat suma sa fie 13
deci x=1, y=12
x=0, y=13,
x=2, y=11
x=3, y=10
x=4, y=9
x=5, y=8
x=6, y=7
x=7, y=6
x=8, y=5
x=9, y=4
x=10, y=3
x=11, y=2
x=12, y=1
x=13, y=0