Beyond the Basics

59. $x + y + z = 1$ $x + y + z = 1$
61. $x + \frac{2}{3} y + \frac{1}{3} z = \frac{1}{3}$ $x + \frac{2}{3} y + \frac{1}{3} z = \frac{1}{3}$
63. $y = x^{2} + 2 x + 1$ $y = x^{2} + 2 x + 1$
65. $y = x^{2} - x + 2$ $y = x^{2} - x + 2$
67. $x^{2} + y^{2} - 16 = 0$ $x^{2} + y^{2} - 16 = 0$
69. $x^{2} + y^{2} - 2 x + 6 y - 15 = 0$ $x^{2} + y^{2} - 2 x + 6 y - 15 = 0$
71. ${(- \frac{9}{14}, \frac{9}{19}, - \frac{9}{2})}$ ${(- \frac{9}{14}, \frac{9}{19}, - \frac{9}{2})}$
73. $c = - \frac{16}{5}$ $c = - \frac{16}{5}$
75. $y = - 2 x^{2} + 4 x + 5$ $y = - 2 x^{2} + 4 x + 5$

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Table of Contents for Beyond the Basics