Page 442 - Algebra 1

d. Write an equation in slope-intercept form for the line that passes
(Ex 4) through (-1, 3) and is perpendicular to a line with equation y = _4 x + _5 .
77
e. Geometry Use the slopes of the line segments to (Ex 5) show that ABC is a right triangle.
O
x
-4
-2
2
4
B
Practice
Simplify. 1. √ 36 0
(61)
Distributed and Integrated
2. √ 25 2 (61)
3. √ 38 4 (61)
5. (x-2)(x-9) (58)
Find the product using the FOIL method. 4. (x2 +5)2
(58)
6. Graph the inequality c ≥ - 5. (50)
7. Justify Explain how you find the LCM of 2(x - 5)3 and 3(x - 5)7. (57)
8. Multiple Choice The key of a stem-and-leaf plot shows 2⎥ 9 = 2.9 cm. What is the
(62)
*9.
(62)
value of a data point with a leaf of 4 and a stem of 7?
A 4.7cm B 7.4cm C 47cm D 74cm
Sports The results in seconds for the men’s 50-meter freestyle swimming finals at the NCAA Division II Championship in 2007 are listed below. Create a stem-and- leaf plot to organize the data.
20.43, 20.32, 20.36, 20.39, 20.67, 20.68, 20.68, 20.81, 20.62, 20.97, 21.07, 21.24, 21.25, 21.31, 21.45, 21.56
10. Multi-Step The cost of parking at a concert is $22 for the first 2 hours and $4 for (52) each additional hour. Write an equation that models the total cost y of parking
a car in terms of the number of additional hours x. Using the linear equation, find the total cost of parking for 9 hours.
11. Error Analysis Two students attempted to write an inverse variation equation (64) relating x and y when x = 5 and y = 10. Which student is correct? Explain
the error.
4
y
C
A
2
Student A
_ y = 50
x
Student B
y = 2x
Lesson 65 427