Question

Diketahui fungsi f(x)=ax+b. nilai f(3)=5 dan f(-1)=-11. maka nilai f(2)=…

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Answer 1

F(3) = 3a+b = 5 ...(1) f(-1) = -a+b = -11...(2) di eliminasi aja ya 3a+b = 5 -a+b = -11 ___________- 4a = 16 a = 4 3x4 + b = 5 12 + b = 5 b = -7 f(2) = 2x4 + (-7) = 8 - 7 = 1

Answer 2

Kita cari nilai a & b dulu
 nilai a 
f (3) = 5     ==> 3a + b = 5
f (-1) = -11 ==> -1a + b = -11 ( hasilnya di kurang)
                       4a        = 16
                         a        = 16/4 = 4
nilai b 
3a + b = 5
3.3 + b = 5 
9 + b = 5
b = 5 - 9 = -4

maka, nilai f(2) =
f(x) = 3x + (-4)
f(5) = 3.5 -4
 f(5) = 15 -4 = 11

jadikan yang terbaik yah :)