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f(-2) = -8 --->-2p + q = -8 ---> q = 2p - 8 (pers 1)
f(5) = 13 ---> 5p + q = 13 (pers 2)
substitusi pers 1 ke 2
5p + q = 13
5p + (2p - 8) = 13
5p + 2p - 8 = 13
7p = 13 + 8
7p = 21
p = 21/7
p = 3 ---> q = 2p - 8
q = 2x3 - 8
q = 6 - 8
q = -2
jd f(x) = px + q = 3x - 2
Cari nilai q :
Sehingga, bentuk fungsi :