1. An integer is seven more than another integer. Twice the larger integer is one less than the square of the smaller integer. Find the two integers.( There are 2 answers)

i used (x+7) and multiplied it w/ (x+7x2). Is that correct ?

2. A car dealership has been selling new cars at $6000 over the factory price. Sales have been averaging 80 cars per month. Because of inflation, the $6000 markup is going to be increased. The marketing manager has determined that, for every $100 increase, there will be one less car sold each month. What should the new markup be in order to maximize revenue ?

How do you answer this ?