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f(0) = -3 -> b = -3
f(6) = 0 -> 6a + b = 0
substitusi nilai b
6a + b = 0
6a + -3 = 0
6a = 3
a = 3/6 = 1/2
jd rumus persamaan : 1/2 x - 3
f(2) = 1/2 (2) - 3
f(2) = 1-3
f(2) = -2