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Chapter 4: Q 209 (page 443)
Use Row Operations on a Matrix In the following exercises, perform the indicated operations on the augmented matrices .
Perform the needed row operations that will get the first entry in both row and row to be zero in the augmented matrix:
The required matrix is
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A motor boat traveled miles down a river in two hours but going back upstream, it took hours due to the current. Find the rate of the motor boat in still water and the rate of the current. (Round to the nearest hundredth).
Translate to a system of equation and solve.
The difference of two supplementary angles is degrees. Find the measures of the angles.
In the following exercise, solve the systems of equations by elimination.
Solve the system by graphing:
Translate to a system of equations and solve:
Greta wants to make pounds of a nut mix using peanuts and cashews. Her budget requires the mixture to cost
her per pound. Peanuts are per pound and cashews are per pound. How many pounds of peanuts and
how many pounds of cashews should she use?
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