Can someone solve this for me ? ? need done today

Slope of side  WX =  (4-2) / (2- -5)  = 2/7

line ZY will have the same slope as its opposite line WX
so 2/7  =( y - -3) / (x - -7)  where x and y are the coordinates of point y.

2/7 = (y + 3)/(x + 7)
2x - 7y = 7

slope of WZ = 5/2

slope of  XY  5/2 also  

5/2 = ( y -4) / x - 2)  = 5/2

5x - 2y = 2
2x - 7y = 7

solving these 2 equations we get x = 0 and y = -1

Answer coordinates of y are (0, -1)