L1-6: Writing Equations

1
L1-6 Writing Equations

• Objectives (Do not write)
• Students will become familiar with and model word
  problems
• Students will solve algebraic word problems

2
Solving Word Problems a) Name a variable b)
Write an equation c) Solve (check)

• Types of problems
• Translate
• Percent
• Set amount per unit amount

part is the amount affected by the and must
match the
Original (starting) amount
Change per unit
Set amount
3
Examples Write an equation and solve.

• An appliance repair service charges 50.00 per
  job plus 12.00 per hour. What is the cost of a 3
  hour job?
• a) Let ccost and hhours

50
12
b) C ____ h _______
c) C 12(3) 50 C 86
4
2) If you invested in a stock at and the
value is now . What percent of the
original investment is the value now?
a) Let ppercent
b) c)
5
Challenge

• The World Record (WR) for 800m run has decreased
  since 1930 by 1.82min minus 0.0035 times years
  since 1930. What would be the current (2010) WR
  time?
• How would you find years passed?
• Let t time to run and y of years
• t 1.82 0.0035(y)
• t 1.82 0.0035(80)
• t 1.54 minutes
• Extra Look it up!! Is this true????

Subtract 1930 from current year
Did you know 800 m is ½ mile!!!!