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f(1) = 2
f(2) = 1
a = (2-1) / (1 - 2)
a = 1/-1
a = -1
f(1) = 2
-1 + b = 2
b = 2 +1
b = 3
rumua fungsinya
f(x) = ax + b
f(x) = -x + 3
a.bentuk sederhana dari f(x-1)
-(x -1) + 3
-x + 1 + 3
-x + 4
b.bentuk sederhana dari f(x) + f(x-1)
-x + 3 + ( -x + 4)
-x + 3 - x + 4
-2x + 7