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Equations With Variables on Both Sides

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Equations With Variables on Both Sides. Ms. Turk, Algebra I. Unit 2-4. Check Skills You'll Need ... This equation is called an identity. Example E: 2(x - 4) ... – PowerPoint PPT presentation

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Title: Equations With Variables on Both Sides


1
Equations With Variables on Both Sides
  • Ms. Turk, Algebra I
  • Unit 2-4

2
Check Skills Youll Need
  • 6x - 2x
  • 2x - 6x
  • 5x - 5x
  • -5x 5x
  • 4x 3 -5
  • 4x
  • -4x
  • 0
  • 0
  • x -2

3
Example A 6x 3 8x - 21
  • 6x 3 8x - 21
  • - 6x - 6x
  • 3 2x - 21
  • 21 21
  • 24 2x
  • 2 2
  • x 12

6x 3
8x - 21
4
Example B -6d d 21
  • -6d d 21
  • - d - d
  • -7d 21
  • -7 -7
  • d -3

5
Example C m - 8 3m
m - 8 3m - m - m
-8 2m 2
2 -4 m
6
Example D 10 - 8a 2(5 - 4a)
10 - 8a 2(5 - 4a) 10 - 8a 10 - 8a
8a 8a 10 10 Always true!
This equation is called an identity.
7
Example E 2(x - 4) 2x - 8
2(x - 4) 2x - 8 2x - 8 2x - 8 -
2x - 2x -8 -8 Always true! This
equation is an identity.
8
Identity
An equation that is true for every value of the
variable. The equation 3x 3x is an identity.
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