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2a + b = 12 .. (1)
f(-3) = - 23
- 3a + b = - 23 .. (2)
eliminasi:
2a + b = 12
- 3a + b = - 23
____________ _
5a = 35
a = 7
b = - 2
rumus fungsi:
f(x) = 7x - 2