Question

X,y € N , stiind ca 3 x X x Y = 38 si x × y +2 = 16

Answer 1

Daca exercitiul este transmis corect , atunci avem:

          3*x*y - 2y = 38

                si  x*y + 2 = 16  ⇔  x*y = 14

                                           ↓

                                       3*14 - 2y = 38 

                                       42-38 = 2y  deci  2y=4 ⇒ y=2

                                                                                  ↓

                                                                               x*2 + 2 = 16

                                                                               x = 14:2 = 7.

    R: x=7 si y=2 .