Question

X+4y+2z=13
3x+2z=11
determinați x,y,z

Answer 1

Răspuns:

x+4y+2z=13|*-1

3x+2z=1

-x-4y-2z=-13

3x+2z=1

-x-4y=-13

3x=1

-1/3-4y=-13

x=1/3

-1/3+13=4y

-1+39/3=4y

38/3=4y

12.6=4y

y=3,15

x=1/3 aprox 0.(3)

y=3.15