Question

Rezolva sistemul
3x - 4y = 142
x + 3y = - 2.

Answer 1

Răspuns:

3x - 4y = 142

x + 3y = -2 | • (-3)

3x - 4y = 142

-3x - 9y = 6

-------------------- +

/ -13y = 148 | : (-13)

y = - 148/13

=> x + 3y = -2

x + 3(-148/13) = -2

x + (-444/33) = -2 | (-444/33)

x = 444/33/2

S={(444/33/2, 148/13)}