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WK3HW – JO
Section 2.1
51. a.) Approximately how much of the $850 monthly payment
goes for interest in year 5? In year 15? In year 25?
Year 5 – about $750
Year 15 – about $600
Year 25 – about $300
b.) In what year will the monthly payment be equally divided between
interest and principal?
In the 22
nd
year
Section 2.2
15.
2x – y = 9
y = 2x +9
y = 2x  9
y = mx +b
m = 2 and b = 9 so the slope is 2 and the yintercept is 9
19.
6x 9y = 16
9y = 6x +16
y = 6/9x 16/9
6/9 = 2/3
y = 2/3x – 16/9
y = mx + b
m = 2/3 and b = 16/9 so the slope is 2/3 and the yintercept is 16/9
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View Full Document 33.
4x – 3y = 6 and 3x + 4y = 8
3y = 4x + 6
4y = 3x + 8
y = 4/3x  2
y = 3/4x +2
The slopes are the coefficient of x
The slopes are 4/3 and 3/4, so the lines are perpendicular.
35.
3x + 2y = 8 and 6y = 5 9x
2y = 3x + 8
6y = 59x
y = 3/2x + 4
y = 3/2x + 5/6
The slopes are the coefficient of x
The slopes are 3/2 and 3/2, so the lines are parallel.
41.
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This note was uploaded on 01/17/2010 for the course MATH 105 taught by Professor Dobra during the Spring '09 term at Upper Iowa.
 Spring '09
 Dobra

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