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f(-3)= -3a + b = 13
---------------------- -
5a =-10
a = -2
2(-2) + b = 3
-4 + b = 3
b = 7
-a+b = -(-2) +7 = 9
f(2)= 2a+b = 3
f(-3)=-3a+b =13
diperoleh (2a+b) - (-3a+b) = 3-13
5a = -10
a = -2
a= -2 ⇒ 2a+b = 3
2 (-2) + b = 3
-4 +b = 3
b = 7