By Ron Larson

With a similar layout and have units because the industry major Precalculus, 8/e, this addition to the Larson Precalculus sequence presents either scholars and teachers with sound, constantly based causes of the mathematical strategies. Designed for a two-term direction, this article includes the gains that experience made Precalculus a whole answer for either scholars and teachers: attention-grabbing functions, state-of-the-art layout, and cutting edge know-how mixed with an abundance of rigorously written routines. as well as a quick algebra overview and the center precalculus issues, PRECALCULUS WITH LIMITS covers analytic geometry in 3 dimensions and introduces suggestions coated in calculus.

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C) Predict the number of units occupied when the rent is $595. 133. GEOMETRY The length and width of a rectangular garden are 15 meters and 10 meters, respectively. A walkway of width x surrounds the garden. (a) Draw a diagram that gives a visual representation of the problem. (b) Write the equation for the perimeter y of the walkway in terms of x. (c) Use a graphing utility to graph the equation for the perimeter. (d) Determine the slope of the graph in part (c). For each additional one-meter increase in the width of the walkway, determine the increase in its perimeter.

Slope ϭ change in y change in x ϭ rise run ϭ y2 Ϫ y1 x2 Ϫ x1 The Slope of a Line Passing Through Two Points The slope m of the nonvertical line through ͑x1, y1͒ and ͑x2, y2 ͒ is mϭ y2 Ϫ y1 x2 Ϫ x1 where x1 x2. When this formula is used for slope, the order of subtraction is important. Given two points on a line, you are free to label either one of them as ͑x1, y1͒ and the other as ͑x2, y2 ͒. However, once you have done this, you must form the numerator and denominator using the same order of subtraction.

67. 69. 71. 73. 75. 77. 6͒ ͑2, Ϫ1͒, ͑13, Ϫ1͒ ͑73, Ϫ8͒, ͑73, 1͒ 66. 68. 70. 72. 74. 76. 78. 2͒ In Exercises 79– 82, determine whether the lines are parallel, perpendicular, or neither. 1 79. L1: y ϭ 3 x Ϫ 2 L2: y ϭ 1 3x ϩ3 81. L1: y ϭ 12 x Ϫ 3 L2: y ϭ Ϫ 12 x ϩ 1 80. L1: y ϭ 4x Ϫ 1 L2: y ϭ 4x ϩ 7 82. L1: y ϭ Ϫ 45 x Ϫ 5 L2: y ϭ 54 x ϩ 1 In Exercises 83– 86, determine whether the lines L1 and L2 passing through the pairs of points are parallel, perpendicular, or neither. 83. L1: ͑0, Ϫ1͒, ͑5, 9͒ L2: ͑0, 3͒, ͑4, 1͒ 84.