ANSWER

Step-by-step explanation
The diagonals of a parallelogram bisects each other.
Therefore

This implies that,

We make x the subject to get,

Similarly,


This implies that,

We substitute equation (1) in to equation (2) to get,

We expand the bracket to get,

We group like terms to get,


Divide both sides by 4 to obtain,

We put the value of y into equation (3) to get,

