Question

Diketahui f(x) = ax+b. jika f(-1) = 5 dan f(-3) = -13, maka f(1) adalah...

a. 20
b. 21
c. 23
d. 25

Answer 1

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Answer 2

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F(x) = ax + b
f(-1) = 5
f(-3) = -13

Ditanya :
f(1)=....?


Jawaban :

f(-1) = 5

ax + b = 5
a(-1) + b = 5
-a + b = 5
b = 5 + a


Subtitusi nilai b pada persamaan berikut:

f(-3) = -13

ax + b = -13
a(-3) + b = -13
-3a + 5 + a = -13
-2a = -13 - 5
-2a = -18
a = -18/-2
a = 9


Tentukan nilai b:

b = 5 + a
b = 5 + 9
b = 14


Maka, nilai
f(1) = 9a + 13
f(1) = 9(1) + 14
f(1) = 23 ➡Opsi C


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