Which expression shows the difference between david's weight (x) and kathy's weight (y)?

Which system of linear inequalities is represented by the graph?

Solve 2x+y=3 x+y=5 in substitution method

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?