Solving TwoStep Equations

1
Solving Two-Step Equations

• September 9th, 2008
• EQ You have 2.10 remaining on your phone card.
  You pay 7 cents for each minute of a call and a
  75 cent charge for using a pay phone. If you make
  a call from a pay phone, what is the maximum
  whole number of minutes that you can talk?

2
Review of One-Step Equations

• X 73 182
• 2.4y 52.8
• -9 X 33

3
One-step Vs. Two-step

• Whats the difference?
• x 5 25 4x 5 25

4
How to solve two-step equations

• 2x 1 5
• 1 1
• 2x 6
• 2 2
• x 3

• Undo addition or subtraction
• Undo multiplication or division
• Simplify

5
Examples of Solving Two-Step Equations

• x 14 8
• 2

• Undo addition or subtraction
• Undo multiplication or division
• Simplify

6
Examples of Solving Two-Step Equations

• 8 12 2x

• Undo addition or subtraction
• Undo multiplication or division
• Simplify

7
Examples of Solving Two-Step Equations

• -6x 5 23

• 6 16 - x

8
Word Problems

• You have 2.10 remaining on your phone card. You
  pay 7 cents for each minute of a call and a 75
  cent charge for using a pay phone. If you make a
  call from a pay phone, what is the maximum whole
  number of minutes that you can talk?

9
Homework

• Practice Workbook Section 3.3
• Pg. All Problems