diketahui f(x) = ax + b. jika f(5) = -8 dan f(-2) = 13 nilai f(3) adalah ?

Bab Fungsi
Matematika SMP Kelas VIII


5a + b = -8
-2a + b = 13. -
7a = -21
a = -3

5a + b = -8
-15 + b = -8
b = -8 + 15
b = 7.

Nilai f(3)
= -3(3) + 7
= -9 + 7
= -2

Semoga membantu;)

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