The solution to the query
1) x = pounds of peaches purchased
2) y = total price for the peaches
3) the formula is: y = $2x
but I'm not clear on what you need to know...
To determine the answer, you need to divide 405 by 50 to discover the weight of a single coin. The calculation should appear like this:

= 8.1
The precise weight is 8.1 grams, but if you are looking for an estimate, the conclusion should be
Approximately 8 grams for a one-dollar coin