fungsi(x)=ax + b. jika f(2)=1 dan f(4)=5,maka nilai dari f(10)adalah

Kelas 8 Matematika
Bab Fungsi

f(x) = ax + b

f(2) = 2a + b = 1
f(4) = 4a + b = 5

4a + b = 5
2a + b = 1
--------------- -
2a = 4
a = 2

2a + b = 1
2 . 2 + b = 1
b = 1 - 4
b = -3

f(x) = 2x - 3

f(10) = 2 . 10 - 3
f(10) = 20 - 3
f(10) = 17

- Fungsi -

f(x) = ax + b

f(2) = 2a + b
1 = 2a + b
b = 1 - 2a

f(4) = 4a + b
5 = 4a + (1-2a)
5 = 2a + 1
2a = 4
a = 2

b = 1 - 2(2) = 1 - 4 = -3

f(x) = 2x - 3
f(10) = 2(10) - 3 = 20 - 3 = 17

semoga membantu
-vin