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### SIFAT 1 (Commutativity of Function Composition)
This section asks you to evaluate if the composition of two functions \( f \circ g \) and \( g \circ f \) is commutative. 

1. **Find \( (f \circ g)(x) \)**: This means applying \( g(x) \) first and then applying \( f \) to the result.
2. **Find \( (g \circ f)(x) \)**: This means applying \( f(x) \) first and then applying \( g \) to the result.

If \( (f \circ g)(x) = (g \circ f)(x) \), the composition is commutative. Otherwise, it is not.

### SIFAT 2 (Associativity of Function Composition)
This section explores whether function composition is associative by evaluating \( (f \circ g) \circ h \) and \( f \circ (g \circ h) \).

1. **Find \( ((f \circ g) \circ h)(x) \)**: Apply \( h(x) \), then \( g \), and finally \( f \).
2. **Find \( (f \circ (g \circ h))(x) \)**: Apply \( h(x) \), then \( g \), and then \( f \).

If both results are the same, the composition is associative.

### SIFAT 3 (Identity Function in Composition)
This problem investigates the identity property using the identity function \( I(x) = x \).

1. **Find \( (f \circ I)(x) \)**: Since \( I(x) = x \), the result should just be \( f(x) \).
2. **Find \( (I \circ f)(x) \)**: Similarly, this should also return \( f(x) \).

If \( f \circ I = I \circ f \), then the composition has the identity property.

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Let me know if you would like detailed calculations for each part or if you have any specific questions about one of the sections. Here are some related questions you might consider:

1. How do you verify if function composition is commutative using specific examples?
2. What are the steps to check for associativity in function compositions?
3. Why is the identity function important in function composition?
4. How do linear functions behave under composition?
5. Can a non-linear function exhibit commutativity under composition?

**Tip:** When working with compositions, always apply the functions in the correct order—starting from the innermost one!

Buatlah 3 fungsi linier yang berbeda, dan temukan sifat-sifat dari komposisi fungsi (komutatif, asosiatif, identitas).

Explore the properties of function composition, including commutativity, associativity, and the identity function, using linear functions. Suitable for high school students in Grades 10-12.

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