Respostas

2014-03-21T15:01:20-03:00
A) f(x) = ax +b
3=5(2) + b
3=10+b

b=7
a=5 ----- > f(x) = 5x-7

b)
-3= (-1).(-2) + b
-3+2=b
b=-1      --- > f(x) = -2x - 1

c)-6=1/2(2)+b
-6=1+b      -------- > f(x) = 2x -7
-7=b