Respostas

2014-08-10T21:34:20-03:00
Aplique a propriedade distributiva:
6-2y+14-7y=15-4y
Isole o y:
-2y-7y+4y = 15-6-14
-5y = -5
y = 1
11 4 11
2014-08-10T21:36:26-03:00
2.(3-Y) + 7(2-Y) = 15-4Y
6 - 2Y +14 - 7Y = 15 - 4Y
-2Y - 7Y + 4Y = 15 - 6 - 14
-5Y = -5
Y = -5/-5
Y = 1
11 4 11