# x + 4 - PowerPoint PPT Presentation

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x + 4. x + 4 = -5. Subtraction. what you do to one side, you must do to the other!. addition. what you do to one side, you must do to the other!!. http://studyjams.scholastic.com/studyjams/jams/math/algebra/add-sub-equations.htm. Using Models. 7 + n = 12. +. n. =. Using Models.

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x + 4

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x + 4

x + 4 = -5

Subtraction

what you do to one side, you must do to the other!

what you do to one side, you must do to the other!!

Using Models

7 + n = 12

+

n

=

Using Models

n - 5 = 9

-

=

n

Using Models

+

=

n

Using Models

-

n

=

Paper and Pencil

Will you add or  subtract to find

the value of p?

p - 4 = 14

18

Paper and Pencil

Will you add or  subtract to find

the value of c?

9 + c= 9

0

Paper and Pencil

Will you add or  subtract to find

the value of s?

s - 3 = 15

18

Paper and Pencil

Will you add or  subtract to find

the value of v?

10 + v = 16

6

What are the missing values?

15 + 9 = 24

96 + 14 = 110

56 - 35 = 21

82 - 6 = 76

37 - 24 = 13

24 - 12 = 12

x + 5 = 11

x = ?

x + 5 = 11

x + 5 - 5 = 11- 5

x

x = 6

6 + 5 = 11

Model the equation

x

x

Write an equation:

Write an equation:

=

=

Solve the equation:

Solve the equation:

11 = x + 9

x + 3 = 7

11 - 9 = x + 9 - 9

x + 3 - 3 = 7 - 3

x = 2

x = 4

4 + 3 = 7

11 = 2 + 9

Solving subtraction equations

x - 9 = 47

x - 51 = 33

x - 51 + 51 = 33 + 51

?

?

x - 9 + 9 = 47 + 9

?

x = 84

x = 56

84 - 51 = 33

56 - 9 = 47

2

2 + v = 4

Pull

Pull

d + 8 = 13

5

Pull

Pull

s - 5 = 2

7

Pull

Pull

11 + x = 15

4

Pull

Pull

3

7 + p = 10

Pull

Pull

b - 7 = 11

18

Pull

Pull

l + 3 = 5

2

Pull

Pull

g - 5 = 6

11

Pull

Pull

b+5, subtract 5 is the inverse operation

subtract 5 from both sides of the equation, the 2 sides remain equal

says that the sum of any # & 0 is that #. So, b+0=-3 is b=-3

Remember What You Learned

8)

inverse = opposite

b/c of the inverse operation used to get a variable alone

y-4, inverse operation is to add 4 to get the variable alone

when you add 4 to each side of the equation, the 2 sides remain equal

add 4 to each side of the equation