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Question: How do I use 'subs' for an implicit equation?

Question:How do I use 'subs' for an implicit equation?

Vahid_math 15 Maple 18
December 17 2018
2

I am writting the following commands in Maple 18.

imp_fun := -4*x + 10*(x^2)*(y^(-2)) + y^2 =11: c := 2: s := evalf( solve( subs( x = c, imp_fun))): m1 := evalf( subs ( { x = c, y = s[1] }, implicitdiff( imp_fun, y,x)));

Now I expect to see a value for m1 but I see again the last command in blue.

Could you please help me to see the value for m1 by writting these commands?
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