Answer:
Linear Equation:
y = 12.5x
This is assuming the first price is $12.50. Each new bid will add another $12.50 to it (so multiply by the amount of bids there are).
Proportional:
The amount that goes up is corresponding. This is true, for:
x = 1, y = 12.5 (x12.5)
x = 2, y = 25 (x12.5)
x = 3, y = 37.5 (x12.5)
etc. etc.
Where y is the selling price of sculpture:
This is true, for y stands for the total amount that it will cost the bidder.
Where x is the number of new bids:
x is the amount that of bids in all.
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