1. Use the graphical method to solve the following pair of equations. 4a - 36 =-3 and 5a - b = 10 2. Solve the following pair of equations using either the substitution or elimination methods. Verify your solution. y- 3x= 11 and 5x + 30 = 4y 3. Mr. and Mrs. Chudnowski paid $1050 to fly with their three children from Winnipeg to Regina. Mrs. Ramsey paid $610 for herself and two children on the same flight. What were the airfares per adult and per child? 4. Buckerfields Garden Supply makes custom fertilizer by mixing appropriate combinations of bulk 6% nitrogen fertilizer with bulk 22% nitrogen fertilizer. How many kilograms of each type should be mixed to make 300 kg of 16% nitrogen fertilizer? (Hint: The weight of nitrogen in the mixture equals the total weight of nitrogen in the two components mixed together.) 5. Below is a list of costs. Classify each of them as variable, fixed, or mixed (a combination of variable and fixed components) a. Site license for software b. Leasing costs for a delivery truck ( $600 per month plus $0.40 per kilometer ) c. Packaging materials for products d. Insurance 6. A small manufacturing operation can produce up to 250 units per week of a product that it sells for $20 per unit. The variable cost per unit is $12, and the fixed costs per week are $1200. * How many units must the firm sell per week to break even? * Determine the firm's weekly profit or loss if it sells: (i) 120 units per week. (ii) 250 units per week