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f(1) =-3
a+b=-3
f(3) = 5
3a+b=5
a+b = -3 dikali 3 ---- 3a + 3b = -9
3a+b= 5 dikali 1 ---- 3a + b = 5
2b = -14
b = -7
maka, a = 4
bentuk fungsinya ax +b = 4x -7