If $\frac{x}{2} = \frac{6}{y} = 2$,then the value of $x - y$ is ..........

The sum of a two-digit number and the number obtained by reversing the digits is $66$. If the digits of the number differ by $2$,find the number. How many such numbers are there?

.......... is not a linear equation of two variables.

The equation $3x - 2y + 5 = 0$ can be written as:

Solve the following pair of linear equations:
$21x + 47y = 110$
$47x + 21y = 162$

If in a rectangle,the length is increased and breadth reduced each by $2$ units,the area is reduced by $28$ square units. If,however,the length is reduced by $1$ unit and the breadth increased by $2$ units,the area increases by $33$ square units. Find the area of the rectangle.