1. x-6
constant: 6
variable: x
operation: subtraction
2. y+1
constant: 1
variable: y
operation: addition
3. 13/b
constant: 13
variable: b
operation: division
4. 3xy
constant: none
variable: x,y
operation: multiplication
5. 2y
constant: none
variable: y
operation: multiplication
Please mark as the brainliest!