Question 620126
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Hi,
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Rhombus.svg/200px-Rhombus.svg.png ">
Thw paralellogram is a rhombus, and its asking to solve for xy. 
Note: sides of a rhombus are of equal length
3y+4 = 7y-4 
  8 = 4y      y = 2 
2x+4 = 4x+2   
   2 = 2x     x = 1 and     xy = 1·2 = 2