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f(3) = 15
f(5) = 20
a.nilai a & b
f(3)=15
f(3) = 3a + b = 15
f(5) = 5a + b = 20
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-2a = -5
a = 0,4
3a + b = 15
3.(0,4) + b = 15
1,2 + b = 15
b = 15 - 1,2 = 13,8
b. bentuk fungsi
f(x) = 0,4(x) + 13,8
c.nilai f(-11)
f(-11) = 0,4(-11) + 13,8 = 9,4
maaf kalo salah :)):