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39.
40.
Using Graphing Formulas
41–50 Solve by using the necessary formula.
41. Find the slope of the line through the points (−2, 3) and (4, 9).
42. Find the slope of the line through the points (−4, −3) and (−6, 2).
43. Find the slope of the line through the points (4, −3) and (4, −7).
44. Find the slope of the line through the points (−2, −9) and (2, −9).
45. Find the distance between the points (−8, −1) and (−2, 7).
46. Find the distance between the points (0, 16) and (7, −8).
47. Find the distance between the points (6, −5) and (−4, 3).
48. Find the midpoint of the segment between the points (−5, 2) and (7, −8).
49. Find the midpoint of the segment between the points (6, 3) and (−4, −4).
50. Find the midpoint of the segment between the points
Applying Graphing Formulas
51–60 Use an appropriate formula to compute the indicated value.
51. Find the perimeter of triangle ABC, whose vertices are A (1, 1), B (1, 4), and C (5, 1).
52. Find the perimeter of the parallelogram DEFG, whose vertices are D (0, 10), E (9, 13), F (11, 7), and G (2, 4).
53. Find the center of the rhombus HJKL, whose vertices are H (0, 3), J (4, 6), K (8, 3), and L (4, 0).
54. Determine which type(s) of triangle ABC is if the vertices are A (1, 1), B (4, 5), and C (9, −5).
55. Determine which type of triangle ABC is if the vertices are A (0, 0), B (0, 12), and C
56. Find the length of the altitude of triangle ABC, drawn to side AC, with vertices A (0, 0), B (5, 12), and C (21, 0).
57. Find the length of the altitude of triangle DEF, drawn to side DF, with vertices D (2, 3), E (2, 12), and F (42, 3).
58. Find the area of the parallelogram PQRS with vertices P (4, 7), Q (7, 12), R (15, 12), and S (12, 7).
59. Find the area of circle A if the endpoints of its diameter are at (6, 13) and (−8, 21).
60. Find the area of triangle ABC with vertices A (0, 0), B (5, 12), and C (14, 0).
Chapter 2
Solving Some Equations and Inequalities
The object of solving equations and inequalities is to discover which number or numbers will create a true statement in the given expression. The main techniques you use to find such solutions include factoring, applying the multiplication property of zero, creating sign lines, finding common denominators, and squaring both sides of an equation. Your challenge is to determine which techniques work in a particular problem and whether you have a correct solution after applying those techniques.
The Problems You’ll Work On
In this chapter, you’ll work with equations and inequalities in the following ways:
Writing inequality solutions using both inequality notation and interval notation
Solving linear and quadratic inequalities using a sign line
Determining the solutions of absolute value equations and inequalities
Taking on radical equations and checking for extraneous roots
Rationalizing denominators as a method for finding solutions
What to Watch Out For
Keep in mind that when solving equations and inequalities, your challenges will include
Factoring trinomials correctly when solving quadratic equations and inequalities
Choosing the smallest exponent when the choices include fractions and negative numbers
Assigning the correct signs in intervals on the sign line
Recognizing the solution when a factor of the expression is x
Determining which solutions are viable and which are extraneous
Squaring binomials correctly when working with radical equations
Finding the correct format for a binomial’s conjugate
Using Interval and Inequality Notation
61–70 Write the expression using the indicated notation.
61. Write the expression
62. Write the expression
63. Write the interval notation
64. Write the interval notation
65. Describe the graph using inequality notation.
Illustration by Thomson Digital
66. Describe the graph using inequality notation.
