Question

Diketahui fungsi f(x) = px+q.
jika f(-3) = -23 dan f(4) = 19, nilai f(2) adalah...
a. -7
b. -5
c. 5
d. 7

Answer 1

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

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

f(2)=6(2)-5=7

Answer 2

F(x) = px + q
f(-3) = -3p + q
-23 = -3p + q ... (i)
f(4) = 4p + q
19 = 4p + q ... (ii)

dari persmaan (i) dan (ii)..
-3p + q = -23
 4p + q =  19 -
- 7p = -42
   p = 6
substitusi :
4(6) + q = 19
  q = 19 - 24
  q = -5

jadii, 
f(x) = px + q
f(2) = 6(2) + (-5)
       =  7

semogaa jawabnkuu bermanfaat n mmuasskan ;)