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f(1) = 3
f(1) = a.1 + b
f(1) = a + b
3 = a + b.... persamaan 1
f(-3) = 11
f(-3) = a.(-3) + b
f(-3) = -3a + b
11 = -3a + b......persamaan 2
a + b = 3
-3a + b = 11
------------------- --
4a = -8
a = -2
a + b = 3 ==> -2 + b = 3 ==> b = 3 + 2 = 5
f(1) = a(1)+b=3
= a + b = 3
f(-3) = a(-3)+b =11
f(-3) = -3a+b = 11
a+b=3 a+b =3
-3a+b=11 -2+b=3
___________ _ b = 3+2
4a = -8 b = 5
a = -8 : 4
a = -2 maka rumus nya f(x)=-2(x)+5