This is NOT the graph of a function y=f(x). However, if you
solve the original equation for y in terms of x, you can break the graph into
two pieces, each of which is the graph of a function.
The real solution are : x= -4/sqroot7, y= 2/sqroot 7
x= 4/sqroot7, y= -2/sqroot
7
integer solution are: (-1,2) , (1,-2), (1,1)
