Question

There's a function table and they want me to find the missing value. It looks like this:

x y
0 -1
1 1
3
4 7
5 9

I need help figuring out what the function is between them also, if you have a method please share? Thanks :)

Answer 1

well lets look
x goes from 0-1...then 3....then 4,5....so it looks like it would go up by 1 every time right? so lets write that
x
0
1
2
3
4
5

okay now y
start -1...goes to 1....what is that? a +2 change right?
from 4-5....we go from 7 to 9 right? ALSO a +2 change...
so we can assume it will be consistant and go up by 2 every number so

-1
1
3
5
7
9

hmm it works out doesnt it.... so we have

x y
0 -1
1 1
2 3
3 5
4 7
5 9

look right?

Answer 2

Wait but what exactly would be the function? Shouldn't there be a set function?

Answer 3

yes....the function would be y = 2x - 1
makes sense right?

if x is 0
2(0) - 1 = -1
x is 1
2(1) - 1 = 1
x=2
2(2) - 1 = 3

make sense?

Answer 4

Yes, thank you so much for your replies.

Answer 5

not a problem :)