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F(3) = 3a + b = -3
--------------------------- (-)
-5a = 10
a = 10 / -5
a = -2
Substitusikan a ke pers ( 1 )
-2a + b = 7
-2 ( -2 ) + b =7
4 + b = 7
B= 7-4
B= 3
Bentuk fungsinya f(x)=ax + b = -2x + 3