The value of the dependent variable if the value of the independent variable is –4 would be 18.
Even though everything can be almost always related to its reason, when we talk about two related things, there might happen that one of those things is dependent on the other.
If a variable is taking its values independently of any visible direct cause, then that variable is called an independent variable.
The independent variable is the X so you just replace the X with -4.
[tex]f(x) = -5x + \dfrac{x}{2}\\\\f(x) = -5(-4) + \dfrac{(-4)}{2}\\\\f(x) = 20 + (-2)\\\\f(x) = 18[/tex]
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