Respuesta :
18
Substitute the given values for x and y into the expression
(5 × 4 ) -[tex]\frac{4}{2}[/tex] = 20 - 2 = 18
We have been given an expression as [tex]5x - \dfrac{x}{y}[/tex] when x=4 and y=2 the value of the expression will be 18.
How to evaluate a given mathematical expression with variables if the values of the variables are known?
You can simply replace those variables with the value you know of them and then operate on those values to get a final value.
This is the result of that expression at those values of the considered variables.
we have been given an expression as
[tex]5x - \dfrac{x}{y}[/tex]
when x=4 and y=2
Substitute the given values for x and y into the expression
[tex](5 \times 4 ) -\dfrac{4}{2} \\\\= 20 - 2\\ \\= 18[/tex]
Learn more about evaluating a function at a value here:
https://brainly.com/question/2753269
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