3.3 Applications of Linear Functions


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1 3.3 Applications of Linear Functions A function f is a linear function if The graph of a linear function is a line with slope m and yintercept b. The rate of change of a linear function is the slope m. Example 1: Graph 2 3 Solution: The slope of the line is 2 and the yintercept is 3. Most of this section deals with the following basic relationships: Revenue = (price per item)(number of items) or Cost = variable costs + fixed costs Profit = Revenue Cost or The relationships in this section are linear functions. In examples 24, determine the following cost functions. 2. A gym charges a $175 initiation fee, plus $35 per month. Solution: Cost = variable costs + fixed costs The fixed cost is $2000 and 40 items cost $5000 to produce. Solution: The cost function is
2 In economics, the rate of change of the cost function is called the marginal cost. If the cost function is a linear function, then the marginal cost is the slope m. 4. The marginal cost is $120 and 100 items cost $15,800 to produce, find the cost function. Solution: , , ,800 = b The cost function is: If is the total cost in producing x items, then the average cost per item is given by: 5. If the total cost of producing x items is given by ,500, determine the average cost per item when 75,000 items are produced. Solution: 75, ,000 16,500 $672,750 The average cost per item when 75,000 are items are produced is,, $ A machine is now worth $120,000 and will depreciate linearly over an 8year period at which time it will be worth $25,000 as scrap. a) Determine the linear depreciation function f. b) What is the domain of f? c) What will the machine be worth in 6 years? Solution: a) 120,000 25, ,000 95, ,875 11, ,000 b) The domain is 0,8 c) 6 11, ,000 6 $48, A computer that cost $1200 new is expected to depreciate linearly at a rate of $300 per year. a) Determine the linear depreciation function f. b) Explain why the domain of f is 0,4 Solution: a) b) The domain of f is 0,4, since at 4 years the computer will be worth nothing and
3 after 4 years it would be worth a negative amount, which does not make sense. 8. The total cost (in dollars) of producing x compact disks is ,000 a) What are the fixed costs? b) What is the marginal cost per disk? c) What is the total cost of producing 50,000 disks/ d) What is the average cost per item when 50,000 are produced? Solution: a) $450,000 b) $6.80 per item c) 50, , ,000 50,000 $790,000 d),, $ The manager of a restaurant found that the cost of producing 100 cups of coffee is $11.02, while the cost of producing 400 cups is $ Assume the cost function is linear. a) Find the cost function b) Find the total cost of producing 1000 cups. c) What is the marginal cost? d) What is the average cost per cup when 1000 cups are sold? Solution: a) Solve this system b) $98.32 c) The marginal cost is 9.7 cents per cup d). 9.8 cents per cup The number of units at which the revenue equals cost (that is profit equals 0) is the breakeven point.
4 10. The profit (in millions of dollars) from the sale of x million units of an item is given by The cost is given by a) Find the revenue equation b) What is the revenue from selling 10 million units? c) What is the breakeven point? Solution: b) R = $16 million c) R = C million items 11. The cost of producing xitems is given by and the revenue is given by 95. Determine the breakeven point. Should this item be produced if only 400 units can be sold. Solution: = 15x x = The break even point is about 467 units. This item should not be produced since only 400 units can be sold, thus the company will not break even or make a profit. The Law of Supply: As the price of a commodity increases the quantity supplied of that commodity increases. This is because the business that makes that commodity wants to sell as much of their good at the highest price. The Law of Demand: An economic law that states that consumers buy more of a good when its price decreases and less when its price increases. In supply and demand problems, we use p for price and q for quantity. The equilibrium point is the point where the supply curve intersects the demand curve. 12. Let the supply and demand for radial tires in dollars be given by Supply: Demand: 81
5 a) Graph these equations b) Find the equilibrium quantity c) Find the equilibrium price Solution: b) q = 324 q = 36 The quantity equilibrium is 36 units c) The price equilibrium is 36 $54
Example 2: A company s car has an original value of $85, 000 and will be depreciated linearly over 6 years with scrap value of $10,000.
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