Fungsi f dirumuskan dengan f(x)= ax+b. jika f(2)=1 dan f(4) = 7 ,maka nilai a+2b adalah ...... A.-7. B.-2. C.2. D.7 (serta caranya ya kak plis kak makasi kak)
Ifnly
F(x) = ax + b f(2) = 1 ~> 2a + b = 1 f(4) = 7 ~> 4a + b = 7 -------------- - -2a = -6 a = 3
2a + b = 1 2 . 3 + b = 1 6 + b = 1 b = 1 - 6 b = -5
f(2) = 1 ~> 2a + b = 1
f(4) = 7 ~> 4a + b = 7
-------------- -
-2a = -6
a = 3
2a + b = 1
2 . 3 + b = 1
6 + b = 1
b = 1 - 6
b = -5
a + 2b = 3 + 2 . (-5)
= 3 - 10
= -7
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