Question

Rezolva ecuatiile prin metoda substitutiei
{x=5
{3x+y=4

Answer 1

Răspuns:

{x = 5

{3x + y = 4

3×5 + y = 4

15 + y = 4

y = 4 - 15

y = - 11

Answer 2

{x=5

{3x+y=4

3x5+y=4

15+y=4

y=4-15

y=-11