Respostas

2013-05-15T23:03:51-03:00

f(x) = ax + b

 

5 = -a + b                   (x3)

-3 = 3a + b

__________

15 = -3a +3b

-3 = 3a + b

__________

12 = 4b

b = 12/4

b = 3

 

5 = -a +3

a = -2

__________

 

f(x) = -2x + 3

f(0) = -2.0 + 3

f(0) = 3

 

0 = -2x + 3

-3 = -2x

x = 3/2 (raiz da função)

 

2 5 2