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Verified answer
F(x) = ax + bf(-2) = a.-2 + b
14 = -2a + b ••• (1)
f(3) = a.3 + b
-1 = 3a + b ••• (2)
-2a + b = 14
3a + b = -1
---------------- -
-5a = 15
a = -3
3a + b = -1
3 (-3) + b = -1
-9 + b = -1
b = 8
Maka,
f(7) = -3.7 + 8
•••• = -21 + 8
•••• = -13
Jawaban : A