Can someone explain this math problem to me so I can show my son how to solve it please

Aline passes through 3,7 and 6,9 what equation represents the line

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.

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers