Posted by **Dawn** on Tuesday, May 26, 2009 at 5:53pm.

Okay. so say their is a list of numbers:

x y

0 3

1 5

2 7

3 9

4 11

I know how to answer a question like "use an equation to figure out Y when X is..." but how do you figure do " figure out X when Y is" ?

I konw that the formula is y=mx+b

but i don't know how to do it

thanks

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