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Evaluate a linear function

To evaluate a function, or find a functional value, means to substitute a given value in the domain into the equation to find the corresponding element in the range.

Given f(x)=x+3, find f(2)

Plug x=2 into the function and simplify.

 f(x) = x+3 f(2) = 2+3 Plug x=2 f(2) = 5 Simplify

Use the function rule f(l)= to find f(-9)
Solution: f(-9)=