How do I solve this?

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Find the values of y: 3y^3(y^2+ 2/3y)=0

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.