Question

resolva o sistema

12x-5y=18
y-2/3x= -1

Answer 1

$12x - 5y = 18 \\ - \frac{2}{3} x + y = - 1 \: \: \: ( \times 5) \\ \\ 12x - 5y = 18 \\ - \frac{10}{3} x + 5y = - 5 \\ \\ 12x - \frac{10}{3} x = 13 \\ 36x - 10x = 39 \\ 26x = 39 \\ x = \frac{39}{26} \\ x = \frac{3}{2} \\ \\ 12( \frac{3}{2} ) - 5y = 18 \\ \frac{36}{2} - 5y = 18 \\ 36 - 10y = 36 \\ - 10y = 36 - 36 \\ - 10y = 0 \\ y = 0$

Resposta final: x = 3/2 , y = 0