In an exam, a student wrote the following answer.
"The level curve of $f ( x , y )$ at the point (3,-4)is $x ^ { 2 } - 2 x y = 34$ ."
How can you tell that the answer is wrong without even knowing the formula for f?

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The Answer of In an exam, a student wrote the following answer.
"The level curve of $f ( x , y )$ at the point (3,-4)is $x ^ { 2 } - 2 x y = 34$ ."
How can you tell that the answer is wrong without even knowing the formula for f?

In an Exam, a Student Wrote the Following Answer f(x,y)f ( x , y )f(x,y)

In an Exam, a Student Wrote the Following Answer $f ( x , y )$