I am in a algebra 1 class and we are learning about variables and slope and all that stuff , and also were mainly talking about the substitution method and elimination method .. and I do not understand nothing at all

okay .. then what is your questions ..

answer: domain and range mean all possible values of x and y that could be substituted to the inequality. a solution means all possible values that make the inequality statement true. so while the range is still all real numbers, the solution is the shaded area, for which y will always be greater than the line of the function.