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Solving TwoStep Equations

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Mini-Lesson. To solve two step equations, you need to add or subtract first. ... Work Time. Solve each equation. Check your solution. 2a 7 = 15 2. 8 1.2c = 2 ... – PowerPoint PPT presentation

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Title: Solving TwoStep Equations


1
Solving Two-Step Equations
  • Class 840

2
Mini-Lesson
  • To solve two step equations, you need to add or
    subtract first. Then you need to multiply or
    divide.
  • Example
  • 6X 3 21
  • 6X 3 3 21 3 Add 3 to each side
  • 6X 24 Divide each side by 6
  • 6
  • X 4

3
Another Example
  • Y 2.5 7.5
  • 10
  • Y 2.5 2.5 7.5 2.5 Subtract 2.5 from
    each side
  • 10
  • 10 (Y) 10 (5) Multiply each side by 10
  • 10
  • Y50

4
Work Time
  • Solve each equation. Check your solution.
  • 2a 7 15 2. 8 1.2c 2
  • 3. 6e 12 72 4. 7f 8.4 16.8
  • G 11 16 6. 4 r - 16
  • 2 5

5
Another Problem
  • To convert a temperature in degrees Celsius to
    degrees Fahrenheit you can use the formula F 9C
    32.
  • 5
  • If the outside temperature is 63 F, what is the
    temperature in degrees Celsius? Round to the
    nearest whole degree.

6
Homework
  • Skills Intervention Workbook
  • Page 56 7 18 and word problem 22.
  • For the word problem you need to write a two step
    equation. Read the problem carefully and
    determine which is the variable. What does the
    equation equal to? Will you add or subtract? Will
    you multiply or divide?

7
Solve These Two Steps
  • 7X 5.8 13.1 12X 10 -130
  • In 1995 the monthly cost to use America Online
    was 9.95 (including 5 hours of usage), plus
    2.95 for each additional hour. Phil paid 30.60
    in March.
  • Let x be the number of additional hours that
    Phil used. Write and solve an equation to find
    x.
  • b. How many hours did Phil use America Online
    in March?
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