Please help me and explain. I don't understand.

X+y=-4 x-y=2 use elimination with adding and subtraction

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

Which value of y will make the inequality y< -1 false?