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3a+b: 2
dieliminasi
3a+b: 2
a+b: -4
--------------- -
2a: 6
a: 3
masukkan 3 ke a
3.3+b=2
9+b=2
b: 2-9 : -7
b: -7
b. f(x): ax+b
f(1) = a(1) + b = 4
a + b = 4
f(3) = a(3) + b = 2
3a + b = 2
a + b = 4
3a + b = 2
-------------- -
-2a = 2
a = -1
-1 + b = 4
b = 5
f(x) = -x + 5