Jan wants to make several batches of a recipe for cheesy mashed potatoes. The graph shows the relationship between the number of
pounds of potatoes and the number of cups of shredded cheese used to make the recipe.
Cups of Cheese
0
6 9 12
Pounds of Potatoes
Based on the graph, what is the number of cups of cheese used for each pound of potatoes?
Looking at the picture, we know <ABD and <DBC make up <ABC. Knowing this, we can set up an equation like so, plug in the known values, and solve to find m<DBC: