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If u(x,y) = x^2 + 3xy + y - 2019, then (∂u/∂x)|(4,-5) is equal to ... (a) -4 (b) -3 (c) -7 (d) 13

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If u(x,y) = x2 + 3xy + y - 2019, then (∂u/∂x)|(4,-5) is equal to ...

(a) -4 

(b) -3 

(c) -7 

(d) 13

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(c) -7

∂u/∂x = 2x + 3y

(∂u/∂x)(4,-5) = 8 - 15 = - 7

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