Question

S={2x+y=10
{x+3y=15​

Answer 1

Explicação passo-a-passo:

{2x+y=10 ×(-3)

{x+3y=15

(.-6x - 3y= - 30

( x + 3y=15

============(+)

-5x = - 15

x = 15/5

x = 3

2x + y = 10

2.(3) + y = 10

6 + y = 10

y = 10 - 6

y = 4