Find y for the function

Question

For f(x)=3|2x-5| and x=1, find y.

Answer 1

First, remember that f(x) is the same as y.

 

So by asking you to find f(x), they want you to find y.

 

Replace f(x) with y in the equation to make it easier to understand.

 

y = 3 |2x - 5|

 

Now, we know x = 1, so substitute 1 for x in the equation

 

y = 3 |2(1) - 5|

 

Now solve for y

 

y = 3 |2 - 5|

y = 3 |-3|

y = 3 (3)

y = 9

 

Does this make sense? I live in Knoxville. I would be glad to tutor you in person if you like. Please contact me and let me know your schedule so we can set up a time to meet.

 

Thanks!

Answer 2

y = f(x)  that is, the DEPENDENT variable value depends on what INDEPENDENT value (x) is used in the function evaluation.

when we say that a point on a graph of a function is (x,y), that is the same as saying (x,f(x)).

 

So just plug in 1 and you'll have the correct OUTPUT, y = f(1)