How do i find the variable for each spot

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

What function has a range {yly< 5}? question on picture above^

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image