what is the linear equation in two Variables `?`

Which of the following is not a linear equation in two variables

1/x+1/y=2 is a linear equation in two variables?

Using variable form the linear equation in two variables.

Graph of a Linear Equation in Two Variables

By using x and y as a variable , write two linear equations in two variables.

If a pair of linear equations in two variables is consistent, then the lines represented by two equations are

The graph of a pair of linear equations in two variables is represented by…………

Which of the following is not a linear equation is two variable