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19 = 4a + b
7 = 2a + b
dieliminasi / dikurang, menjadi:
12 = 2a
12 : 2 = a
6 = a
7 = 2a + b
7 = 2.6 + b
7 = 12 + b
7 - 12 = b
-5 = b
rumus f(x) = ax + b
menjadi f(x) = 6x - 5