Diketahui rumus fungsi f(x)=ax+b jika f(b)=13 dan f(-2) =-11 maka f(7) adalah?

f(6) = 6a + b = 13
f(-2) = -2a + b = -11
================= (-)
8a = 24, maka a = 3 dan b = -5

f(7) = 3(7) - 5 = 21 - 5 = 16

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