Converting one part of the equation into another

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Homework Statement

http://img90.imageshack.us/img90/8280/picture1mc2.png
In my answer guide, how do I eliminate h from the beginning part of this equation? Can someone give me hints to fill in the missing gap?

Homework Equations

None

The Attempt at a Solution

I don't know how to get rid of h first. :(

 

[coffeem]

Rearrange one of the expressions so that they are both expressions for h. Then equate them (or just put them together) and you will have eliminated h.

 

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I still don't know how to rearrange them D:

 

[HallsofIvy]

If you have never learned algebra, you are going to have a very difficult time through out this course since it clearly assumes you did. The first equation, h= (1/2)gt^2 is already solved for h. You can just replace h in the second euation, (2/3)h= (1/2)g(t- \Delta t)^2 by (1/2)gt^2. Or, doing as coffeem suggests, since h is multiplied by 2/3, you can multiply both sides by 3/2 to get rid of that 2/3.