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There were two proof sets issued in 1987. The regular proof set is worth $11.00. The 'Prestige' proof set which included the 'Constitution Dollar' is worth $45.00.
There were four types of United States Mint Proof Sets produced in 1992. The normal 1992-S Proof Set is worth approximately $6-$8. The Prestige set (with Olympic half and dollar) is worth approximately $70-$90. The regular Silver set is worth approximately $10-$15. The Silver Premier Set is worth approximately $10-$16.
One standard form that is used quite frequently is to set everything to zero, for example: 5x - 7y + 10z - 13 = 0
a triangle is not regular