Help asap plz!! im doing this test rn and i don’t understand algebra

Me because some of question i don’t understand

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

Which system of linear inequalities is represented by the graph?