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Problem 1
You manage an ice cream factory that makes three flavors: Creamy Vanilla, Continental Mocha, and Succulent Strawberry. Into each batch of Creamy Vanilla go eggs, 1 cup of milk, and 2 cups of cream. Into each batch of Continental Mocha go 1 egg, 1 cup of milk, and 2 cups of cream, while into each batch of Succulent Strawberry go egg, 2 cups of milk, and 1 cup of cream. You have in stock 350 eggs, 350 cups of milk, and 400 cups of cream. How many batches of each flavor should you make in order to use up all of your ingredients? HIIT [See Example 1.]
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You are row-reducing a matrix and have chosen a \(-6\) as a pivot in Row 4. Directly above the pivot, in Row 1 , is a 15 . What row operation can you use to clear the \(15 ?\)
Equilibrium Price The demand and supply functions for pet chias are, respectively, \(q=-60 p+150\) and \(q=80 p-60\), where \(p\) is the price in dollars. At what price should the chias be marked so that there is neither a surplus nor a shortage of chias? HIMT [See Example 7.]
Use Gauss-Jordan row reduction to solve the given systems of equation. We suggest doing some by hand, and others using technology. HINT [See Examples 1-6.] $$ \begin{array}{r} x-y+z-u+v=1 \\ y+z+u+v=2 \\ z-u+v=1 \\ u+v=1 \\ v=1 \end{array} $$
Your friend Frans tells you that the system of linear equations you are solving cannot have a unique solution because the reduced matrix has a row of zeros. Comment on his claim.
Use technology to obtain approximate solutions graphically. All solutions should be accurate to one decimal place. Find the intersection of the line through \((4.3,0)\) and \((0,5)\) and the line through \((2.1,2.2)\) and \((5.2,1)\).
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