<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def delete_virtualip(self, loadbalancer, vip):
 """Deletes the VirtualIP from its load balancer."""

        lb = vip.parent
        if not lb:
            raise exc.UnattachedVirtualIP("No parent Load Balancer for this "
                    "VirtualIP could be determined.")
        resp, body = self.api.method_delete("/loadbalancers/%s/virtualips/%s" %
                (lb.id, vip.id))
        return resp, body