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- [Instructor] In this video, were going to get a little bit of practice setting up systems of linear equations based on a word problem. Were not actually going to end up solving it. You can do that if you like just for kicks. But really were going to just focus on setting it up. So here were told Lauren uses a blend of dark roast beans and light roast beans to make coffee at her cafe. She needs 80 kilograms of beans in total for her next order. Dark roast beans cost $3 per kilogram, light roast beans cost $2 per kilogram, and someone wants to spend $220 total. Let D be the number of kilograms of dark roast beans she buys and L be the number of kilograms of light roast beans she buys. All right, so based on this information that weve been given, see if you can pause this video and set up a system of equations. And its going to have two equations with two unknowns, D and L, that in theory we could solve to figure out the right number of kilograms of dark roast beans and light roa
