Respostas

2013-11-13T15:44:44-02:00
Y = x + 7 
0 = x + 7
x = -7

f(x) = 5x + 5
5x + 5 = 0
5x = -5
x = -1

f(x) = - x/2 + 3
-x/2 + 3 = 0
-x + 6 = 0 
-x = -6
x =6

y = -3x+ 6 
-3x + 6 = 0 
-3x = - 6
x = 2

y = -3x + 2
-3x + 2 = 0
-3x = -2 
x = 2/3

f) y = 2 - x/2
-x/2 + 2 = 0
-x + 4 = 0
-x = -4
x =4
4 3 4