Question

{3x + y = 10
{x-2y=1​

Answer 1

Resposta:

x - 2y = 1

x = 1 + 2y

3.(1 + 2y) + y = 10

3 + 6y + y = 10

7y = 10 - 3

7y = 7

y = 7/7

y = 1

x = 1 + 2y

x = 1 + 2.1

x = 1 + 2

x = 3