Simplify each expression below by combining like terms. Then match it to it's simplified expression.
3y + 2y + y² +5+y
3y² + 2xy +1+3x+y+2x²
3xy + 5x + 2+ 3y + x +4
4m + 2mn + m² + m +3m²
:: 2z²+9zy + 1
:: 2x² + 3x + 4y + 2xy + 1
:: 12xy + 6
:: 4m² + 4m + 2mn :: y² + 5y + 5
:: 6x + 3y + 3xy +6
:: 4m² + 5m + 2mn
:: y² + 6y + 5