Bell Ringer:
1. Each of the first 4 pit stops a race car driver makes loses ten seconds off the leader. The pit crew makes adjustments, and at each of the next two pit stops he gains 7 seconds on the leader. How much time is the driver off the leader?
A. 40 seconds
B. 14 seconds
C. -26 seconds
D. -54 seconds
2. Spot the mistakes on the following answers, and correct them:
a) 5(4x + 8) = 120 b) 7(2a - 5) = - 21
20x + 8 = 120 14a - 35 = -21
20x = 112 14a = - 56
X = 5.6 a = - 4
Classwork:
- Exploring Multi-Step Equations MATERIALS •
paper and pencil
HOW TO PLAY
Form a group of four students.
There is no talking in this game.
One person in the group will be handed a piece of paper with an equation printed on the top.
Perform one step in solving the equation, then pass the paper to the next person in the group.
The student receiving the paper must review the work already performed, make corrections if necessary.
Then perform the next step in solving the equation and pass the paper to a third member of the group.
Each person receiving the paper must first check the work done by prior group members and then perform an additional step.
The person holding the paper when the equation is completely solved brings the paper to the front of the room.
When all groups have finished the final solvers write the solution on the board. T
he starting position rotates with each new equation.
PRACTICE In Exercises 1–9, solve the equation.
1. –3 = 5 - 3a + 4
2. 10x - 4x - 5 = 25
3. 15 = 8t + (–3t)
4. 4a - 2(a - 3) = 16
5. 17 = 3(y + 1) - 4y
6. 3/4 (16x − 4) = 21
7. 2/5 (x − 3) − 2 = 6
8. 3(x - 2) + 1 = –4
9. 3(x - 8) + 2x = –22
Closer:
What were some common mistakes that you and your classmates made in solving multi-step equations? How can you avoid making these mistakes in the future?.
How important was it that each member of your group showed their work clearly? Why is it important to show all of your steps in solving an equation?
Homework:
Study for Simplifying Expressions and Solving Equations Test Thursday
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