exam Maths Puzzle Numerical Ability

Determine whether the relation is a function.

x^2=1+y^2

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exam Other Question
The Coin Shop will purchase at most $20.00 per person per day in silver coins, provided that the are packaged in sets of 6 nickels, 4 dimes, and 1 quarter. What is the greatest number of sets that Steve could bring to the shop to sell? how would i solve for x:

x
___
x - 2 =



4
_____
5