A.

b and c.
add 5 to both sides:

subtract 3n from both sides:
Answer:
is not a function
Step-by-step explanation:
Given




Required
Which is not a function
A function is of the form 
Assume a function is:

In simple terms:
For an ordered pair to be regarded as a function, no x value must be repeated
Analyzing the options:
1. 
This is a function because none of the x values (-3, 8, 0 and -9) appeared more than once
2. 
This is a function because none of the x values (5, -3, 0 and -9) appeared more than once
3. 
This is a function because none of the x values (9, -5, 5 and 6) appeared more than once
4. 
This is not a function because one of the x values (2) appeared more than once.
i.e.
and 
X(x-6) = 391
x2-6x-391 =0(x-23)(x+17)=0
since the number of seats should be positive,
x = 23
The number of rows is 23 - 6 = 17
( To check our work )
391 / 17 = 23
So, there are 17 rows of seats.
9514 1404 393
Answer:
(4, -2)
Step-by-step explanation:
If (x, y) is part of the relation f, then (y, x) will be in the inverse relation f^-1.
The point contained in f^-1(x) is (4, -2).
_____
<em>Additional comment</em>
The range of f is {2, -4, -2, -4}, which has -4 repeated. That means <em>the inverse relation is not a function</em>. We can say that (4, -2) is a point contained in the inverse relation, but we cannot say that f^-1(x) is a function.