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f(x)= px+q
f(5)=p(5)+q =12
5p+q = 12 ...(1)
f(6)=p(6)+q = 3
6p +q =3 ...(2)
5p + q = 12
6p + q = 3
------------------ - (eliminasi)
-p = 9
p = -9
5p +q = 12
5(-9)+q = 12
-45+q = 12
q = 57
maka nilai p+q = -9 + 57 = 48
diteliti lagi yah