Graph the function xy+25=0

This is the same as saying x*y+25=0.

Also, x*y=-25.

The solution (if you had to find it) would be - 5 and 5.

To graph, it would be y=-25/x

Edit: This can be simplified down to y=-5 since it is a constant so it would be a straight line on the y-axis down at - 5.