Question 106152
Here, f(x) represents y.

And, every value of x has a corresponding value of y.

That's why, x is called the independent variable.

So, just substitute any value of x!>

EXAMPLE

f(x)=-4x+2

FInd f(5)!

f(5)=-4(5)+2
f(5)=-20+2
f(5)=-18


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