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3a + b = 9 - b = 9 - 12
-6a = -24 b = -3
a = -24 : -6
a = 4
f (-2) - f (2) = [4(-2) - 3] - [ 4(2) - 3]
= -11 + 5
= -6
f(x)=ax + b
Bayangan -3, brarti x=-3
f(-3)= -3a + b = -15
f(3) = 3a + b = 9 +
2b = -6
b = -3
3a+b = 9
3a+(-3)=9
3a= 12
a=4
f(-2) = 4(-2)-3 =-11
f(2) = 4(2)-3 =5
f(-2) + f(2) = -6