Math

MTH208 Week 4 Individual Textbook Problems

knave 459, #20

cypher each carcass by graphing.

and

To solve graphic entirelyy, we need points on a line. We can find these by assigning 3 numbers to x and solve for y and then flock them into the equation each time to see that they work. See add-in below for numbers assigned to x which gave us the value for y.
Y=X2x + 3y = 5
X | YX | Y
3 | -2 3 | -0.33
0 | 00 | 1.66
-3| 2-3 | 3.66

knave 461, #70

Solve each system by the substitution method.

and

Plugging in the solutions:


Page 461, #92

Investing her bonus. Donna invested her $33,000 bonus and received a come up of $970 in interest after one year. If part of the specie returned 4% and the remainder 2.25%, then how much did she invest at each rate?
Part 1 of the money invested at 4% = x
Part 2 of the money invested at 2.25% = y

So, $13,000 was invested at 4% and $20,000 was invested at 2.25%

Page 471, #52

Solve each system by substitution or addition.

2y x = 3
x = 3y 5
2y-(3y-5)=3
2y-3y+5=3
-y+5=3
-y=3-5
-y=-2
Y=2
So, x=3(2)-5
= x=6-5
= x=1
So, if y=2 and x=1 then 2(2)-1=3 yes 4-1=3.



Page 472, #72

Books and magazines.



At Gwens garage sale, all books were one charge, and all magazines were another price. Harriet bought four books and three magazines for $1.45, and June bought two books and five magazines for $1.25. What was the price of a book and what was the price of a magazine.

Books = b
Magazines = m

Henrietta bought 4b + 3m = 1.45
June bought 2b + 5m = 1.25

4b + 3m = 1.45
+
-4b - 10m = -2.50 (multiplied by -2 throughout the equation)

= 0 7m = -1.05
= m =0.15

If m=0.15 than 2b + 5(0.15) = 1.25
2b + 0.75 = 1.25
2b = 0.50

= b = 0.25
Henrietta bought 4 books for $1.00 and 3 magazines for $0.45 for a total of $1.45
June bought 2 books for...If you want to get a full essay, order it on our website: Orderessay



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