7.1- 7.3 In Class Practice

For 1-2, solve each system of equations by graphing. 1) y = 2x – 3

y – x = – 1 2) 4x + 3y = 12

2x – 5y = –20 3) For the system, is the ordered pair a solution? (2, 2.4) 4x + 5y = 20 2x + 6y = 10

For 4-5, solve each system by Substitution. 4) 3x – 6y = 30 5) - 2x – y = 1 y = -6x + 34 -6x+2y = – 32

For 6-7, solve each system by Elimination. 6) 5x – 6y = –32 7) 2y + x = 12 –3x – 6y = –48 5x + 2y = -4 8) Multiple Choice: Suppose you have just enough money, in coins, to pay for a loaf of bread priced at $1.95. You have 12 coins, all quarters and dimes. Let q equal the number of quarters and d equal the number of dimes. Which system models the given information?

a. q + d = 12 b. .25q +.10d = 1.95 q + d = 1.95 q + 12 = d

c. .10q + .25d = 12 d. q + d = 12 q + d = 1.95 .25q + .10d = 1.95 For 9, solve the system using any method. 9) Your class sells gift wrap for $4 per package and greeting cards for $10 per package. Your class sells 205 packages in all and receives a total for $1084. Find the number of packages of gift wrap and the number of packages of greeting cards sold.

a. Define your variables.

b. Write two equations that model this situation.

c. Set up a system of equations and solve.