Isoparametric Formulation; it's elementary, really

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Homework Statement


Use the isoparametric formulation to express the following deflection information: U1=0.01cm, U2=0.025 cm with the corresponding global coordinates X1=5cm, X2=12cm
Show the transformation equations between the global coordinate, the local coordinate, and the natural coordinate

Homework Equations


I really wish I knew.

The Attempt at a Solution


I've been confused, oblivious, and completely ignorant enough times that it could be a certifiable miracle I'm a graduate student today, but I cannot recall a time I've been this derailed. I don't even know what this question is asking. If someone could even just be like, "hey do this to get started," I'd be in your debt. I have two textbooks supposedly on this information and neither of them identify what I'm looking at here.
 
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