Help please, guys!! :}

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

What is the slope of the line shown below?

Acarnival sold tickets for $1.50 for adults and $1.00 for students. there were 54 tickets sold for a total of $70.50. write a system of equations to represent the number of adult tickets,x, and the number of student tickets,y. find the solution and explain what it means. i'll you if you me