Question

12x/5 - 6y = 20
x/7 + y/13 = 3/8​

Answer 1

Resposta:

$\frac{12x}{5}-6y=20\quad :\quad x=\frac{5\left(3y+10\right)}{6}$

$\frac{\left(\frac{5\left(3y+10\right)}{6}\right)}{7}+\frac{y}{13}=\frac{3}{8}\quad :\quad y=-\frac{1781}{948}$

Answer 2

Explicação passo-a-passo:

$\frac{12x}{5} - 6y = 20$

$\frac{x}{7} + \frac{y}{13} = \frac{3}{8}$

$.........................$

$12x - 30y = 100$

$104x + 56y = 91$