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a = 6 : 3
a = 2
f(x) = ax + 5 ⇒ f(x) = 2x + 5
f(-3) = 2(-3) + 5
= -1
3a+5=11
3a=6
a=2
bayangan -3, berarti x kita ganti jadi -3
2(-3)+5
=-1