No, you do not set x = 7000. You're asked to set the revenue equal to $7000. The revenue is equal to the number of calculators x times the price per calculator p. So set xp = $7000, and solve for p. Make sense?
The relationship between the number of calculators x that
a company can sell per month and the price of each calculator p is given by x = 1700 - 100p. Find the price at which a calculator should be sold to produce a monthly revenue of $7000.
(Hint given in textbook: Revenue = xp.)
Do I set x = 7000 and solve for p?