Respuesta :

19. 2x²+3x+2
20. x²+x+5
21. 5y+x
22. 4x+y
23. 3y+x-4
24. 4x+y+4
25. 5y+7
26. 2x²+x+2y
    Ps. I didn't really know what the directions were on assignment so i just combined like terms.