A17­4ApplicationsOfLinearSystems.notebook
October 15, 2014
Algebra 1
Ch.7 Notes Page 39
P39 7­4 Applications of Linear Systems
Sep 2­8:31 AM
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A17­4ApplicationsOfLinearSystems.notebook
October 15, 2014
Methods for Solving Systems of Linear Equations
Graphing
Substitution
Elimination
Word Problems
Feb 9­9:25 AM
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A17­4ApplicationsOfLinearSystems.notebook
October 15, 2014
Example
A student buys 7 notebooks and 8 pens for $5.44. He returns later to buy 5 notebooks and 12 pens for $4.64. What is the cost of each notebook and each pen?
n = notebook
p = pen
Feb 23­9:56 AM
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A17­4ApplicationsOfLinearSystems.notebook
October 15, 2014
Break­Even Points
Feb 9­9:24 AM
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A17­4ApplicationsOfLinearSystems.notebook
October 15, 2014
Finding a Break Even Point
A model club publishes a newsletter. Expenses are $.90 for printing and mailing each copy, plus $600 total for research and writing. The price of the newsletter is $1.50 per copy. How many copies of the newsletter must the club sell to break even?
y = dollars of expenses or income
x = number of copies
Feb 9­9:25 AM
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A17­4ApplicationsOfLinearSystems.notebook
October 15, 2014
Ratios
The ratio of boys to girls at a certain college is 4 boys : 5 girls.
How many boys and girls are there if the total number of students is 3,321?
b = boys
g = girls
Feb 9­9:25 AM
6
A17­4ApplicationsOfLinearSystems.notebook
October 15, 2014
HW #44
7­4 P399 #1,2,4,5,6,18,20,22
Please put your name and class period at the top of the homework.
Also include the homework number.
Nov 10­3:09 PM
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