Question

{x + y =3
{12 x - 9y =-20

Answer 1

¡Hey!!

Explicação passo-a-passo:

(1) x+y = 3

(2) 12x-9y = -20

(1) x+y = 3

y = 3-x

(2) 12x-9y = -20

12x-9.(3-x) = -20

12x-27-9x = -20

12x-9x = -20+27

3x = 7

x = 7/3

(1) y = 3-x

y = 3-7/3 => mmc

y = (9-7)/3

y = 2/3

¡Bons estudos & Feliz Natal..