Respostas

2013-12-03T16:31:13-02:00
Y = ax+b
P(2,5) --> x = 2 e y = 5 --> 2a+b = 5 .(-1)
Q(4,9) --> x = 4 e y = 9 --> 4a+b = 9 
--> -2a -b = -5
.......4a+b =  9
------------------------
......2a = 4
a = 4/2
a = 2
4a+b = 9
4.2+b = 9
8+b = 9
b = 9-8
b = 1
y = ax+b
y = 2x+1