A baker is making a large batch of cookies and has a limited amount of flour. The graph shows the relationship between the number of chocolate chip cookies, , and the number of oatmeal raisin cookies, , that can be made. The baker can make a maximum of 100 chocolate chip cookies (and 0 oatmeal raisin cookies) or a maximum of 150 oatmeal raisin cookies (and 0 chocolate chip cookies). Which equation could represent this relationship?