Q2: a) If W =F(x,y), where x =v -g and y = 2vg calculate W +W, b) What is the directional derivative of F(x,y,z)=(x+2y+3z) at point (1,-1,1) in the direction of -2i +2j -k

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Q: thank you so much I understand it now and it worked

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Q: how did you compute the answers?

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Q: The second question wasn't answered.

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.