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Verified answer
F(x) = ax + bf(1) = 5
a(1) + b = 5
a + b = 5
f(3) = -1
a(3) + b = -1
3a + b = -1
eliminasi
a + b = 5
3a + b = -1
----------------- -
-2a = 6
a = -3
a + b = 5
-3 + b = 5
b = 5 + 3
b = 8
rumus fungsinya
f(x) = ax + b
f(x) = -3x + 8