Past sales show that when a scanner is priced at $175, the quantity demanded is 350 units per week. For each $5 drop in price below $175, the quantity demanded rises by 50 units per week. The manufacturer will not market any of the devices if the price is $100 or lower, but for each $10 increase in price, the manufacturer is willing to market an additional 75 items. Write the demand equation and the supply equation. Then find the equilibrium quantity and the equilibrium price