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a) f(-1) = -2(-1) + 7 = 9
f(0)= 7
f(1) =5
f(2) =3
f(3)= 1
f(4)= -1
f(5)= -3
b) diagram panah
0--> 7
1 --> 5
2 --> 3
3 --> 1
4 --> -1
5 --> -3
HP berurutan (0,7),(1,5),(2,3),(3,1),(4,-1),(5,-3)