1) The document provides 4 math word problems and equations to solve using techniques like backtracking and defining variables. 2) It asks the reader to simplify the expression 2(x+6) - 4(3x - 1) and evaluate it for x = -2. 3) Another problem defines a variable to represent the number of giraffes at Brookfield Zoo and writes an expression relating it to the number of giraffes at Lincoln Park Zoo.

1. Opener: 1.) Simplify the following expression. Then evaluate it
for x = ‐2.
2 (x+6) ‐ 4 (3x ‐1)
2.) Define a variable and write an expression to model the
following situation. Brookfield Zoo has a lot of giraffes. For
every 3 giraffes Brookfield Zoo has, Lincoln Park Zoo has 1.
How many giraffes does Lincoln Park Zoo have?
3.) Use backtracking to solve the following equation.
‐3 (x ‐ 4) ‐ 17 = 10
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2. Homework
Questions:
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3. Section 2.9 Getting Started Solving Linear Equations
Ex 1: Solve ‐2 (p ‐15) + 5 = ‐15
Ex 2: Can you solve 5x + 6 = 3x + 12 using back‐tracking? Why
or why not?
How might you solve it then?
Ex 3: Solve 4x ‐ 3 = 2x + 4
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4. More Practice with Ex 4: James says, "I pick a number. I add 1 to my number. I
Number Tricks multiply by 4. I subtract 11. My final result is two times my
starting number." Write and solve an equation to find out
what James's starting number was.
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