Respostas

2014-05-14T23:35:24-03:00
5x+3y=50 (x-5)
8x+5y=81 (x3)

-25x-15y= -250
24x+15y=243
*corta o y*
-x=-7 (-1)
x=7

5(7)+3y=50
3y=15
y=5

S={7,5}