Icleaned 6/9 of my room, and my friend cleaned 2/9 of my room. how much of much of my room do we still have to clean?

1/9 is the answer

9/9 is your whole room, and a total of 8/9 were cleaned (the total of you and your friends work) so do 9/9 - 8/9 = 1/9

in mathematics, a constraint is a condition of an optimization problem that the solution must satisfy. there are several types of constraints—primarily equality constraints, inequality constraints, and integer constraints. the set of candidate solutions that satisfy all constraints is called the feasible set.

hoped i'm right lol