1 / 16

Do these FAST!

Do these FAST!. Solve for x. 1. x – 7 = 19 21 – x = 36 9 x = 45 6 x = 15 x /15 = 3. Answers: x = 26 x = -15 x = 5 x = 5/2 x = 45. Multi-Step Equations. Coordinate Algebra. Essential Question. How do I solve multi-step equations?. Multi-Step Equations.

terri
Download Presentation

Do these FAST!

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Do these FAST! • Solve for x. 1. x – 7 = 19 • 21 – x = 36 • 9x = 45 • 6x = 15 • x/15 = 3 • Answers: • x = 26 • x = -15 • x = 5 • x = 5/2 • x = 45

  2. Multi-Step Equations Coordinate Algebra

  3. Essential Question • How do I solve multi-step equations?

  4. Multi-Step Equations • Equations that contain 2 or more different operations in order to solve the problem. • There will also be equations with variables on both sides.

  5. Solve: A.) 4x – 7 = 9 B.) -9x + 3 = 30 A.) x = 4 B.) x = -3

  6. Solve: C.) D.) C.) x = 20 D.) x = -80

  7. Solve: E.) F.) E.) x = 19 F.) x = -13

  8. x = Tough one!

  9. Multi-step equations • Multi-step equations contain more than one of the same variable. Sometimes these variables are on opposite sides of the equal symbol. • ISOLATE your variable on one side of the equation. 5x – 7 = x + 3

  10. Example 1 • Step A: • Use Addition/Subtraction Properties of Equality to separate all variable terms from number terms on opposite sides of the equal symbol. • Step B: • Solve for x. ALWAYS reduce fractions! • Step C: • Check Solution. • 5x – 7 = x + 3 -x -x____ 4x – 7 = 3 +7 +7 4x = 10 4 4 x = 5 2

  11. Variable terms already together • DO NOT use addition or subtraction property of equality. Simply combine like terms as they are, where they are! 2x + 3x = 25 5x = 25 x = 5

  12. If you see Parentheses . . . • Then your 1st step will be to use the DISTRIBUTIVE PROPERTY • After ( )’s are gone, then follow steps A-C from example 1.

  13. Example 2 • 2(2x + 3) = -4x + 6 4x + 6 = -4x + 6 +4x +4x___ 8x + 6 = 6 - 6 - 6 8x = 0 8 8 x = 0 (not 8 or undefined)

  14. Example 3 • -(3x + 5) = 5x + 1 -3x - 5 = 5x + 1 +3x +3x___ -5 = 8x + 1 -1- 1 -6 = 8x 8 8 x = -3/4

  15. Summarizer • What operation(s) do you start with when solving a multi-step equation? • Addition OR Subtraction!

  16. HOMEWORK • worksheet

More Related