Question

Is this a linear equation `xy=6`?

Answer 1

If both `x` and `y` are variables, then the answer is: "No, it is not a linear equation.".

The linear equation is a sum of terms like "`Ax`" where `x` is a variable, and `A` is a number or a constant.

On the other hand if `x` or `y` was a constant (like `e` or `pi`), it could be treated as a number and the whole expression would become linear.