Solving a Special Relativity Problem with Conservation of Energy and Momentum

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Homework Statement

Ok so I am solving a SR problem...using conservation of energy and momentum I've got to:

Gamma a + 2 Gamma b = 5

And Gamma a * Va = -2 Gamma b * Vb

where gamma is the usual gamma in SR! a and b are labels for 2 particles..

Just need a quick way to solve to find either gamma a or b..

thanks!

Homework Equations

The Attempt at a Solution

 

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anyone ?

 

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heloooo?