MathDB
An equality

Source: Turkey National Mathematical Olympiad 2018

December 2, 2018
inequalitiesalgebrasystem of equations

Problem Statement

Find all pairs (x,y)(x,y) of real numbers that satisfy, \begin{align*} x^2+y^2+x+y &= xy(x+y)-\frac{10}{27}\\ |xy| & \leq \frac{25}{9}. \end{align*}