18. Suatu fungsi f(x) = ax + b jika f(4) = 19 dan f(2) – 7. maka nilala dan badalah …​

Jawaban:

f(x) = ax + b

f(4)= a(4) + b

19 = 4a + b

f(2)= a(2) + b

7 = 2a + b

19 = 4a + b

7 = 2a + b

_________ _

12 = 6a

2 = a

19 = 4a + b

19 = 4(2) + b

19 = 8 + b

19 – 8 = b

11 = b

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