Respostas

2013-12-30T10:00:35-02:00
F(x) = ax+b
y = ax+b
ax+b = y
f(2):
2a+b = 8
f(3):
3a+b = 3

Sistema:
2a+b = 8
3a+b = 3 (-1)

2a+b = 8
-3a-b = -3
----------------------
-a = 5 .(-1)
a = -5
2a+b = 8
2.(-5)+b = 8
-10+b = 8
b = 8+10
b = 18

y = ax+b
y = -5x+18
f(x) = -5x+18