Writing Equations
1. Use variables to represent unknown numbers, or measures, to write a verbal expression
2. Write the verbal expression into an algebraic expression

Words that mean =
   is, equals, is equal to, is the same as, is as much as, is identical to

Example 1: Translate each sentence into an equation
A. A number b divided by three is equal to six less than c

B. Fifteen more than z times b is y times 2 minus 11

4 Step Problem Solving Plan
1. Explore the problem
   • identify what information is given
   • identify what you are asked to find
2. Plan the Solution
   • write an equation
   • choose a variable to represent one of the unknowns (called defining a variable)
3. Solve the Problem
4. Examine the Solution
   • does your answer make sense?
   • does it fit the information in the problem?

Example 2: A popular jellybean manufacturer produces 1,250,000 jellybeans per hour. How many hours does it take them to produce 10,000,000 jelly beans?

Formula: equation that states a rule for the relationship between certain quantities

Example 3: Translate the sentence into a formula
The perimeter of a square equals four times the length of the side

Example 4: Translate each equation into a verbal sentence
A) 12 - 2x = - 5
B) a² + 3b = c / 6

Example 5: Write a problem based on the given information
f = cost of fries
f + 1.50 = cost of a burger
4(f + 1.50) - f = 8.25

Homework: p 124 # 13-43 (3rd), 48-51 all