$\"\"$

Since the quadrilateral is a parallelogram, both pairs of opposite sides are congruent. $\"\"$ (Opposite sides of $\"\"$ are congruent)

$\"\"$ (Definition of congruent segments)

$\"\"$ (Add 18 to each side)

$\"\"$ (Subtract 2x from each side)

$\"\"$ (Divide each side by 3)

The value of x is 6. $\"\"$ $\"\"$ (Opposite sides of $\"\"$ are congruent)

$\"\"$ (Definition of congruent angles)

$\"\"$ (Add y to each side)

$\"\"$ (Divide each side by 4)

The value of y is 24. $\"\"$

The values of x and y are 6 and 24 respectively.