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Question 695657: please help me find if these are functions or not
-2x+4y=0
x to the second power + y to the second power = 8
IF F(X) = 2X-4 AND G(X) = X TO THE SECOND POWER - 4X, FIND EACH VALUE.
G(2)
F(-5)
G(-3)
G(2C)
F(3X)
Answer by MathLover1(20849)   (Show Source):
You can put this solution on YOUR website! if these are functions or not
first recall definition of a  :
A  is a set of ordered pairs in which each  has    associated with it.
1.
graph it first using  and 
 : set 
 ....=>...
: set
 ....=>...
as you can see, each has associated with it, and is a 
Just remember:
A function may not have two y-values assigned to the same x-value, such as ( , ), ( ).
A function  , however, have two x-values assigned to the same y-value, such as (,), ( ).
2.
 .....here you have a circle
is a circle is a function or not , the answer is clearly no, if we use vertical line test
In the Cartesian system, there is no function that whose plot is a circle. In a polar or parametric system functions can readily have circular plots.
3.
if  AND  , than
G(2)...
F(-5)....
G(-3).......
G(2C)......
F(3x)........
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