How many points are common to the graphs of the two equations (2y − x)(x − 4) = 0 and (x − y + 2)(x + y − 4) = 0? HELP QUICK PLSS

For which of the following counts would a binomial probability model not be reasonable? a)the number of people in a classroom born in januaryb) the number of people in a classroom with red hair c) the number of people admitted to a hospital in a day with a particular disease d) the number of heart beats in a one-minute perio.