The cost of a student ticket to the school play is $7. Write an equation that correctly relates the total cost, c, for a particular number, s, of student tickets purchased. Identify the independent and dependent variable

The equation would be:

c = 7s

where c is the total cost and s is the number of student tickets purchased.

The independent variable is s (the number of student tickets purchased) and the dependent variable is c (the total cost).