Jawabanmu

2014-02-10T20:11:10+07:00
2a + b = 1 dan 5a + b = 7
a = 2 , b = -3
f(x) = 2x - 3
f(12) = 2 . 12 - 3
f(12) = 24 - 3 = 21
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2014-02-10T20:12:49+07:00
F(x)=ax+b jika
f(2) = 2a + b = 1
f(5) = 5a + b = 7
             -3a = -6
                a = -6/-3 =2 
2a + b = 1
2.2 + b = 1
b = 1 - 4
b = -3
f(12) = 12a + b
       = 12.2 + (-3)
       = 24 + (-3)
       = 21

1 5 1