Diketahui fungsi f(x)= px+q jika f(-3)= -23 dan f(4)= 19, nilai f(2) adalah??? #latihanUN

F(x) = px + q
F(-3) = - 23
F(4) = 19
F(2) =?
Jawab :
Rumus = px + q
F(-3) = -3p + q = - 23
F(4) = 4p + q = 19
___________ -
- 7p = - 42
p = 6
-3 (6) + q = -23
- 18 + q = - 23
q = - 23 + 18
q = - 5
F(2) = 2p + q
= 2(6) + (-5) = 7

f(-3)=-3p+q=-23
f(4) = 4p+q = 19
________ -
-7p = -42
p = -42/-7
p = 6

4p+q=19
4(6)+q=19
24+q=19
q=19-24
q=-5

f(2)=p(2)+q
=6(2)+(-5)
= 12-5
= 7