<PRE><B>Question 1045739</B>
profit = revenue minus cost.


your cost is 75 dollars per month.


your revenue is 25 dollars for each calculator sold per month.


your profit is the revenue minus the cost.


let x = the number of calculators sold during the month.


your profit equation for the month would be:


profit = 25 * x - 75


25 * x is the revenue for the month.


75 is the cost for the month.


if you let y represent profit, then the equation becomes:


y = 25 * x - 75


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