Hey guys, heres another piece of my problem. I have to make this whole equation A equal to B going in that order. Is my algebra terrible or am I missing something?

A) ½M ((√2E /√M)(η))² + ½K ((√2E /√K)(ξ))² = E

B) η² + ξ² = 1

im at (η²)E/M + (ξ ²)E/K = E

There is more info and depth to this problem which im not sure if its necessary. But if what I explain is not possible, ill fill in the details.

Thanks again guys