83. No solution.
85. (x−2)2+48(y−1)2=64
87. 7–√4
89. 3–√2
91. 2–√2
93. x29+y28 =1
95. Points of intersection: (−1713,−313) and (1,−1)
97. Points of intersection: (2–√, 32–√), (2–√,−32–√), (−2–√, 32–√), (−2–√,−32–√)
99. y=−83x+253
101. 12π
103. 4π
107. 4
109. 103
111. x281+y29=1 or x29+y281=1
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