Chapter 4: Problem 43
Describe the conditions in a problem that enable it to be solved using a system of linear equations.
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Chapter 4: Problem 43
Describe the conditions in a problem that enable it to be solved using a system of linear equations.
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Verify your solutions to any five exercises from Exercises 11 through 36 by using a graphing utility to graph the two equations in the system in the same viewing rectangle. After entering the two equations, one as \(y_{1}\) and the other as \(y_{2},\) and graphing them, use the \([\text { INTERSECTION }]\) feature to find the system's solution. (It may first be necessary to solve the equations for \(y\) before entering them.)
Read Exercise \(72 .\) Then use a graphing utility to solve the systems. $$\left\\{\begin{array}{l}x+2 y=4 \\ x-y=4\end{array}\right.$$
Tourist: "How many birds and lions do you have in your zoo?" Zookeeper: "There are 30 heads and 100 feet." Tourist: "I can't tell from that." Zookeeper: "Oh, yes, you can!" Can you? Find the number of each.
One apartment is directly above a second apartment. The resident living downstairs calls his neighbor living above him and states, "If one of you is willing to come downstairs, we'll have the same number of people in both apartments." The upstairs resident responds, "We're all too tired to move. Why don't one of you come up here? Then we'll have twice as many people up here as you've got down there." How many people are in each apartment?
Will help you prepare for the material covered in the next section. In each exercise, solve the given equation. $$(5 x-1)+1=5 x+5$$
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