Stitches Inc. specializes in making jackets. They only make jean jackets and leather jackets. In a week, they make between 0 and 30 jean jackets and between 0 and 20 leather jackets. It takes a worker 10 hours to make a jean jacket and 20 hours to make a leather jacket. The total number of worker hours can be no more than 500 hours per week. Using `x` for jean jackets and `y` to for leather jackets, type the constraint inequalities into the table.