Substituting Functions: Simplifying Multivariate Expressions

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This is more of a concept question, so the template is not followed.

Say you're given

T(x,y,z) = xy-z

And

z = x+y

Basically, T is a function of x, y, and z while z is a function of x and y. If we substitute z into T, would T become T(x, y) or stay T(x, y, z)?
 
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Your function would become T(x,y)
 
rock.freak667 said:
Your function would become T(x,y)

OK thanks!
 
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