Question

Usando o método da adição, calcule:
5x + 7y = 12
3x + 2y = 1

Answer 1

Explicação passo-a-passo:

5x+7y=12 (*3)

3x+2y=1 (*-5)

______________

15x+21y=36

-15x-10y=-5

11y=31

y=31/11

__________

15x+21(31/11)=36

15x/1 +21/1 *31/11=36/1

15x/1 +651/11=36/1

165x/11+651/11=396/11

165x+651=396

165x=396-651

165x=-255

x=-255/165 (:5)

x=-51/33

______________

par ordenado é (-51/33 ,31/11)