Question

Determină numerele naturale c,y, astfel încât: (x-3) × (y+2)=12

Answer 1

12=1*12
12=2*6
12=3*4
12=4*3
12=6*2
I. x-3=1 =>x=4
y+2=12 =>y=10

II. x-3=2 => x=5
y+2=6 => y=4

III. x -3=3 => x=6
y +2=4 => y=2

IV. x-3=4 => x= 7
y + 2=3 => y=1

V. x-3=6 => x=9
y+2=2=> y=o

(x,y) ={( 4,10),(5,4),(6,2),(7,1),(9,0)}