1. Ch 7-2 Word Problems By
Dr. Marinas

2. Steps to Solving Word Problems
Mathematical Model
Mathematical Solution
Word Problem Interpretation

3. Page 357 #2 (Word Problem) David has 3 times as much money as Rick.
Rick’s money.

4. Page 357 #2 (Math Model) David and Rick has $400.00 together.
If x is the value of Rick’s money, then David has 3x dollars.
So x + 3x = 400

5. Page #2 (Math Solution)
So x + 3x = 400
4x = 400
x = 100

6. Page 357 #2 (Word Problem Interpretation)
x = 100
Rick has $100 (x)
David has $300 (3x)
David has $300
Rick has $100

7. Page 357 #5 (Consecutive Integers)
Name 3 consecutive numbers
Example : 3, 4, 5
If x is the first of the 3 consecutive numbers, what are the other 2?
First is x; second is x + 1; third is x + 2

8. Page 357 #5 (continued) The sum of 3 consecutive integers is 237.
Sum means addition so:
x + (x + 1) + (x + 2) = 237
3x + 3 = 237
3x = 234
x = 78
So the numbers are 78, 79, 80

9. Homework - Pages 357-58 # 3 (like #2 from class)
# 4 (tickets to an event)
# 6 (like #5 only consecutive even integers)
# 9 (like #6 consecutive even integers)
#10 (faculty reduction)
#16 (reading a book)
READ and STUDY section 7-3 Lines