Question

If it cost $60 for 10 students to go on field trip and $70 for 20 student to go on field trip and it cost$80 for 30. How much would it cost for 40 students and 50 students to go on a field trip. What is the equation

Answer 1

y=x +50
total cost = number of students + 50
50 is original cost and each student is 1$ extra
40 students is 90$
50 is 100$