Which function has an inverse that is a function?
b(x) = x2 + 3
d(x) = –9
m(x) = –7x
p(x) = |x|

Question

Which function has an inverse that is a function?
b(x) = x2 + 3
d(x) = –9
m(x) = –7x
p(x) = |x|

satellite73 · Answer

the one that is "one to one"
in this case, the line

satellite73 · Answer

do you know which one is a non horizontal line?

dyna-marie99 · Answer

No

satellite73 · Answer

dang 
do you know what "one to one" means?

satellite73 · Answer

"no" is a fine answer, just asking is all

dyna-marie99 · Answer

Each input has its own output

satellite73 · Answer

sorta 
each input gets an output for every fuction
one to one means each input gets an output no other input gets 
so for example $$p(x)=|x|$$ is NOT one to one since for exaple $$p(-5)=p(5)$$

satellite73 · Answer

neither is $x^2+3$ because $(-2)^2+3=2^2+3$

dyna-marie99 · Answer

Ok

satellite73 · Answer

so that leaves only  two 
the constant function and the line with slope $-7$

satellite73 · Answer

pick the line with slope $-7$ 
it is one to one, the others are not

dyna-marie99 · Answer

Thank you

satellite73 · Answer

yw now i have a question 
do you ride a harley?

satellite73 · Answer

"dyna" just had me wondering

dyna-marie99 · Answer

No, i don't that is my real name

satellite73 · Answer

oh ok  cool just wondering if it had another meaning
like satllite73 is my car

dyna-marie99 · Answer

ohk