Algebra 2 question need help thanks.​

Plzzz i beg u so much asaaaap ! what is the slope of this line? enter your answer in the box.

Determine which postulate or theorem can be used to prove that lmn =nmo

Aschool allots ? 1500 to spend on a trip to the theatre. theatre tickets have a regular cost of ? 55 each and are on offer for 1 5 off. a train ticket for the day will cost ? 12 each. if 2 teachers and the maximum number of students attend, how much money will the school have left over?