Tentukan nilai a dan b pada fungsi f(x)= ax+b jika di ketahui A.f*2)=6 dan f(-5)= -1 B.f(-1)=-11 dan f(3)=1

f(x) = ax + b

Jawab :
f(2) = 2a + b = 6......... x5
f(-5)= -5a + b = -1....... x2
Maka,
10a + 5b = 30
-10a + 2b = -2
------------------------ +
7b = 28
b = 28/7
b = 4

2a + b = 6
2a + 4 = 6
2a = 6-4
2a = 2
a = 1
Maka, nilai a = 1 dan b = 4


B.
f(-1) = -a + b = -11.............. x3
f(3) = 3a + b = 1................ x1
Maka,
-3a + 3b = -33
3a + b = 1
----------------------- +
4b = -32
b = -32/4
b = -8

-a + b = -11
-a - 8 = -11
-a = -11 + 8
-a = -3
a = 3
Maka, nilai a = 3 dan b = -8

Jadikan yg terbaik ya....
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