Question

What is the domain of the inverse of a relation?
A. the domain of the original function
B. the range of the original function
C. all real numbers
D. the line y = x

Answer 1

@sfb

Answer 2

I know it isn't A.

Answer 3

i thought it was c but im not sure ?

Answer 4

it is B. The domain of the original is the range of the inverse.

Answer 5

thank u !

Answer 6

you're welcome

Answer 7

can u answer this one or help ?
Determine if the inverse of function {(-3, -6), (-1, 2), (1, 2), (3, 6)} is also a function.
A. function
B. not a function

Answer 8

if you switch all the pairs in each ordered pair, then look at it again you should be able to decide if it passes the test for a function or not. try it, i'll wait.

Answer 9

im not sure how to do that ?

Answer 10

ok, so with each of those ordered pairs (or tuples, or w/e) you have (x, y)... so you have to switch the x and y values for each. then, if in the NEW ordered pairs there is a value for x that has more than 1 value for y it couldn't be a function, yes?

Answer 11

so the first one, (-3, -6) would become (-6, -3) and so on.

Answer 12

so it is a function ?

Answer 13

well, look at it: to me, after switching the x's and y's, it looks like we have a case where when x = 2, y = -1 OR y = 1. So in that case, what do you think, function or not?

Answer 14

yes .

Answer 15

does it pass the vertical line test? it fails, right? This would not qualify as a function.

Answer 16

ohhh . ok . now i get it .

Answer 17

right, we need to KNOW that when we give it x = 2, it will always spit back out y = 1 (or y = -1, but not both)

Answer 18

ok , thsnk you .

Answer 19

np