Question

x + y = 12 3x - y = 20

Answer 1

Resposta:

x + y = 12 3x - y = 20

x + y = 20

123x - y = 20

124 x = 40

x = 10/31

10/31 + y = 20

y = 610/31

( x, y = ( 10/31 , 610/31)

10/31 + 610/31 = 123 x 10/31 - 610/31 = 20

20 = 20 = 20

SOLUÇÃO=

(x,y) = (10/31, 610,31)