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- [Instructor] In this video, were gonna get some more practice setting up systems of equations. Not solving them, but just setting them up. So were told Sanjays dog weighs five times as much as his cat. His dog is also 20 kilograms heavier than his cat. Let c be the cats weight and let d be the dogs weight. So pause this video and see if you can set up a system of equation, two linear equations with two unknowns that we could use to solve for c and d, but we dont have to in this video. All right so lets do it together. So, what I like to do is usually theres a sentence or two that describes each of the equations we wanna set up. So this first one tells us Sanjays dog weighs five times as much as his cat. So how much does his dog weigh? So his dog weighs d, so we know d is going to be equal to five times as much as his cat weighs. So his cat weighs c, so d is going to be equal to five times as much as his cat weighs. So thats one linear equation using d and c. And so whats