1. Interpreting Parts of an Expression Algebra I Unit 1 D4 1

2. Interpreting Parts of an Expression 1.y = 2.50x + 20 represents Juan’s ticket sales for an upcoming school play. If Juan has already sold $20 worth of tickets, what does the 2.50 represent in the equation? 2.An ice rink charges a flat rate for renting skates plus a fee for every hour skated. The equation modeling the situation is y = 1.25x + 3.50. What does the 3.50 represent? 2

3. Interpreting Parts of an Expression 3.Teresa stops in a convenience store to buy several small water bottles and several large water bottles. Her total is 16.93. If the equation 1.99x + 3.49y = 16.93 models her purchase, what do the coefficients represent? 4.To rent a DVD, a customer must pay a certain amount for the DVD plus an amount for every day that it is late. The situation can be modeled by the equation y = 0.99x + 3.99. What does the constant represent in the equation? 3

4. Interpreting Parts of an Expression 5.A car can travel 28 miles per gallon of gas. The equation y = 28x represents the situation. What does the y represent? 6.Air Force One can travel 630 miles per hour. The equation y = 630x represents the situation. What does the variable x represent? 4

5. Interpreting Parts of an Expression 7.Marsha needs to buy a large amount of pens and one pencil. The purchase amount can be represented by the equation y = 0.70x + 0.10. What does the variable x represent? 8.The equation y = 1250x shows the volume of water pumped into a pool after a certain number of hours. Determine what the variable x represents. 5

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7. A restaurant charges a flat rate plus a certain amount for every visit to the buffet. The equation y = 2x + 4.50 models the total cost. What does the 4.50 represent? 7

8. A moving company charges a set rate for a truck rental plus an amount for every mile traveled. y = 1.50x + 130 models the total cost. Which part of the equation represents cost per mile? 8

9. A theater can be rented for a deposit plus cost per hour. y = 200x + 100 represents the total cost. What does the constant represent? 9

10. A theater can be rented for a deposit plus cost per hour. y = 200x + 100 represents the total cost. What does the x variable represent? 10

11. A musician visits his local store to pick up some guitar strings and guitar picks. The strings are twice the amount of the picks. The equation 1.35x + 2.7y = 17.55 represents his total purchase cost. Which part of the equation represents the amount of guitar picks purchased? 11

12. A musician visits his local store to pick up some guitar strings and guitar picks. The strings are twice the amount of the picks. The equation 1.35x + 2.7y = 17.55 represents his total purchase cost. How many total items were purchased? 12