Let f(x, y) =2x^3 y-xy find the domain

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  x, y ∈ all real numbers

Step-by-step explanation:

For your function ...

  f(x, y) = 2x^3·y -xy

there appear to be no values of x or y for which the function is undefined. The domain for both x and y is "all real numbers."

sorry, i can't understand your question. will later if you describe more clearly!

: )

it has the same slope and a different y-intercept

hope this : )