Question

Como a resposta desta conta ×+6y=5
e2×-y=5

Answer 1

vamos lá:

$x+6y = 5 \qquad \cdot (-2) \\ 2x-y = 5 \\\\ -2x-12y = -10 \\ 2x-y=5\\\\ 2x-2x -12y -y = 5-10\\\\ 13y = 5\\\\ y = \frac{13}{5}\\\\ 2x-y=5\\\\ 2x-\frac{13}{5} =5\\\\ 2x=5+{13}{5}\\\\ 2x = \frac{23+13}{5}\\\\ x = \frac{36}{10}$