I'm not good at functions
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Answer:
When x is equal to 1, y is equal to 18-2(1), which is equal to 16.
When x is equal to 2, y is equal to 18-2(2), which is equal to 14.
When x is equal to 4, y is equal to 18-2(4), which is equal to 10.
When x is equal to 5, y is equal to 18-2(5), which is equal to 8.
Let me know if this helps!