Question

Lege de compozitie : x compus cu y = xy+4x+4y+12
Rezolvati in multimea numerelor reale ecuatia x compus cu x = 12

Answer 1

$y = 12y + 4 \times 12 + 4y + 12 \\ y = 12y + 48 + 4y + 12 \\ y = 16y + 60 \\ 16y - y = 60 \\ 15y = 60 \\ y = \frac{60}{15} \\ y = 4$