Page 431 - Algebra 1

Solve each system of linear equations using the method indicated. 12. Solve by substitution: 6x - 2y = 12 .
(59)
y = -5x + 10 *13. Solve by elimination: 6x + 4y = 22 .
(63)
-6x + 2y = -16
*14. Verify Solve the system of linear equations by graphing: -x + y = 4 Check your
(55)
15.
(53)
answer with a graphing calculator. 2x + y = 1 City Planning The city manager wants to build a rectangular walking
track around the town’s park. Below is a sketch of the new park. 2x Write a polynomial expression for the perimeter of the rectangle.
Simplify the polynomial. 3(x - 2)
*16. Multiple Choice Which ordered pair is a solution of the system of equations? (63)
9x - 3y = 20 3x + 6y = 2
A (-_2, 2) B (2, _2) C (2, -_2) D (-2, _2) 3333
*17. Verify After solving a system of linear equations by elimination, how could you (63) algebraically check your solution?
18. Multi-Step A group of 30 white-tailed deer all had 2 antler points at 1.5 years. At (54) 4.5 years, their points were counted again.
a. Make a box-and-whisker plot for the data set at 4.5 years.
b. Can you predict how many points a deer would have at 4.5 years old if you
know that it had 2 points at 1.5 years?
*19. Geometry Main Market Square in Krakow, Poland has an area of 40,000 m2. Find
(61) the length of one side of the square.
20. Football A football field’s dimensions can be represented by a width of 3x + 15 feet
(58) and a length of x + 10 feet. Write a polynomial expression for the area of the field. Find the missing number.
Number of Points at 4.5 years
2
3
4
5
6
7
8
9
Number of Deer
1
0
4
3
7
4
10
1
21. original price: $1527 (47) new price: ______
22. original price: $25,720 (47) new price: ______
23. original price: $10.25 (47) new price: ______
38% decrease
24. Write Write the two patterns for the square of a binomial.
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215% increase
416 Saxon Algebra 1
1.5% increase