1. {(2, 0)}
2. {x, 4−x2}
3. ∅
4. {(−5, 0)}
5. {(6, 8)}
6. {(−1, 1), (4, 16)}
7. {(−3, 13), (2, 2)}
8.
{xx+−yy==48515
x=250, y=235
9. x +12y+z=2 y−34z=74 z =−2723
10. {(1, 3, 5)}
11. (7, 3,−2)
12. (x, 2x3+73,−x−1)
13. (13,−43+z, z)
14. 53 nickels, 225 dimes, and 22 quarters
15. A(x−5)+B(x+1)
16. Ax−2+Bx+Cx2+1+Dx+E(x2+1)2
17. −10121(x+4)+111(x+4)2+10121(x−7)
18.
19.
20. Maximum value is 6 at (3, 0).
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