Given the function f(x)=5x-9, find the set of values of x such that f(x) = 6. Justify your solution by using the properties of equality

Question

mathmale · Answer

Too bad you chose that user name, and too bad that OpenStudy won't let you change it.
But anyway.
Simply replace f(x) with 6 and equate that to 5x-9.  Solve the resulting equation.

mathmale · Answer

Hint:  add 9 to both sides, and then simplify the equation.

anonymous · Answer

f(6)=5(6)-9
f(6)=30-9=21
the f(x) just needs you to change it :) 
nicce name btw lol

mathmale · Answer

MathWhiz (your new name):
Let's start over.
f(x)=5x-9
But we are told that f(x)=6.  f(x) here is a label.
Then replace f(x) with 6.
6=5x-9
Add 9 to both sides.
You do it, please.

the_fizicx99 · Answer

@hayleya0202 Your answer is incorrect.

mathmale · Answer

We are told that f(x)=6.  We are not told to let x=6 within f(x).

the_fizicx99 · Answer

Yes, as my bff said ^