f didefenisikan dengan rumus f(x)=px+q jika f(3)=-10 dan f(-2)=5,maka nilai f(-6) adalah

f(x) = px + q
f(3) = -10
f(-2) = 5

jawab
3p + q = -10
-2p + q = 5
_________-
5p = -15
p = -15/5 = -3

-2p + q = 5
-2.(-3) + q = 5
6 + q = 5
q = 5 - 6 = -1

f(-6) = px + q
= -3.(-6) + (-1)
= 18 - 1
= 17