Please help lol this is due soon

Me. i can't figure out this question. give an explanation too. .

Asystem of linear equations contains two equations with the same slope. select all of the correct statements. i a. the system may have two solutions. - b. the system may have infinitely many solutions. c. the system may have one solution. o d. the system may have no solution. submit

Use sigma notation to represent the following series for 9 terms.