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f(-10)=8
8=-10p+q
f(-15)=-2
-2=-15p+q
8=-10p+q
-2=-15p+q
________-
10=5p
p=2
8=2*(-10)+q
8=-20+q
q=28
f(5)=px+q
=2*5+28
=10+28
=38
f(-15)=-15p+q=-2→pers2
pers1&2 dieliminasi
-10p + q = 8
-15p + q = -2
----------------- -
5p = 10
p=2
nilai p=2, disubstitusikan ke pers 1
-10p + q = 8
-10(2) + q =8
q= 28.
jd rumusnya f(x) = 2x +28 = x+14.
f(5) = x+ 14 = 5 +14 =19