What is the product of all the coordinates of all the points of intersection of the two circles defined by x^2-2x+y^2-10y+20=0 and x^2-8x+y^2-10y+35=0?

x^2-2x+y^2-10y+20 = x^2-8x+y^2-10y+35

6x = 15

x = 2.5

Now, find the 2 y coordinates to get the 2 coordinates. :))

=^._.^=