Graph Plotting: Determine u & v When Given 1/u & 1/v

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lionely
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Plot a graph of 1/u against 1/v and find the intercept on the 1/u axis.

Determine from your graph

a) the value of u, when v= 27cm
b) the value of v,when u 27cm

I'm sorry but I don't really understand how to find 27cm on my graph when there's nothing like that on it.
 
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Nevermind I'm stupid =.= just do 1/27