Simplify each of the following expressions by collecting like terms:

1)y+y+y+y
2)3y+2y
3)7y-2y+y
4)7y²+5y²
5)4x-3y+x-2y

1 answer

1) 4y
2) 5y
3) 6y
4) 12y²
5) 5x-5y