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## Main Question or Discussion Point

I am having issues figuring out how to do the "in the direction of the vector" part of my problem

I have found the equation of the tangent line but i do not know how to the the next part.

My question asks:

Find the equation of the tangent line to the surface defined by the function f(x,y) = x + e^(xy) at point (2,-1) in the direction of the vector u = <1,-2>

Would i have to figure out the gradient vector of my equation that i find?

I have found the equation of the tangent line but i do not know how to the the next part.

My question asks:

Find the equation of the tangent line to the surface defined by the function f(x,y) = x + e^(xy) at point (2,-1) in the direction of the vector u = <1,-2>

Would i have to figure out the gradient vector of my equation that i find?