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f(2) = - 5 ⇒ 2a + b = - 5
f(-3) = 15 ⇒ - 3a + b = 15
eliminasi:
2a + b = - 5
- 3a + b = 15
___________ -
5a = - 10
a = - 2
b = - 1
a + b = - 3