Define a mapping from the x-y plane, Engineering Mathematics

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Define a mapping from the x,y plane to the u,v plane by u = 2x + y, v = -x +2y .

If a temperature function is given in the x,y plane by T(x,y) = x+y, what is the value, to 3 decimal places, of the corresponding temperature function T1(u,v) at the point (u,v) = (e,f)?

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