Question

Find the critical points of the given function: f(x,y)= xy-x+y

Answer 1

you need to find the points where the partial derivatives both vanish

Answer 2

the partial with respect to x is y-1 and the partial with respect to y is x+1

Answer 3

therefore both partials are zero when you are at the point (-1,1)

Answer 4

does that help?

Answer 5

it confirmed my equation system :)

Answer 6

thank you

Answer 7

great :)