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f(-3) = a (-3) + b
8 = -3a + b ..... (1)
f(5) = a (5) + b
-8 = 5a + b ...... (2)
pers (1) dan (2)
-3a + b = 8
5a + b = -8
___________ -
- 8a = 16
a = -2
5a + b = - 8
5 (-2) + b = - 8
- 10 + b = - 8
b = - 8 + 10
b = 2
jadi, a = - 2 dan b = 2