Question

Dik fungsi f(x)=px+q. jika f(-3)=-23 dan f(4) =19, nilai f(2) adalah

Answer 1

F(x) = px + q
f(-3) = -3p + q = -23............ (persamaaan 1)
f(4) = 4p + q = 19.............. (persamaan 2)
lalu eliminasi persamaan 1 & 2
-7p = -42
p = 6
lalu substitusikan ke persamaan 2
4(6) + q = 19
q = 19 - 24
q = -5

maka f(2) = 6(2) + (-5) = 12 - 5 = 7

jadi jawabannya 7

Answer 2

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

4p+q = 19
4.6 + q = 19
24 + q = 19
q = 19-24
q = -5

f(2) = 2.6 + (-5)
= 12 -5
= 7