1.) Find the demand equation using the given information. (Let x be the number of items.)

A company finds that it can sell 50 items at a price of $90 each and sell 100 items at a price of $60 each.

2.) Find the demand equation using the given information. (Let x be the number of items.)

A company finds that at a price of $130 each it can sell 70 items. If the price is raised $10, then 50 fewer items are sold.

3.) Find the supply equation using the given information. (Let x be the number of items.)

At a price of $1100 a supplier will supply 100 items. If the price decreases by $200, then the supplier will supply 25 fewer items.