Consider the given system da = x(1.5 - 0.5x -y), 4 dy at = y(0.75 - y - 0.125x). (b) Determine all critical points of the given system of equatic 1. (x1, y1) = ( ? , ? ) 2. (22, y2) = ( ? , ? ) 3. (23, 93) = ( ? , ? ) 4. (4, y4) = ( ? , ? )