Ch 7-2 Word Problems By Dr. Marinas
Steps to Solving Word Problems Mathematical Model Mathematical Solution Word Problem Interpretation
Page 357 #2 (Word Problem) David has 3 times as much money as Rick. Rick’s money.
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
Page 357 #2 (Math Solution) So x + 3x = 400 4x = 400 x = 100
Page 357 #2 (Word Problem Interpretation) x = 100 Rick has $100 (x) David has $300 (3x) David has $300 Rick has $100
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
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
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