Transcript Solving Addition and Subtraction Equationgs

Solving Addition and
Subtraction Equations
Lesson 2-6
Procedure
• Isolate the variable by performing
the inverse operation on that
variable.
• The inverse of subtraction is
adding. The inverse of adding is
subtracting.
• Perform the same operation on the
side of the equal sign that does not
have a variable.
Example
y + 13 = 25
- 13 - 13
y
= 12
We want to get the y by
itself. Perform the inverse
operation. The inverse of
adding is subtracting.
Do the same operation on
the other side of the equal
sign.
Check the answer in the
original equation.
y + 13 = 25
12 + 13 = 25
25 = 25
Example 2
k – 12 = 4
+ 12 + 12
k = 16
To get k by itself, we
perform the inverse
operation. The
opposite of “minus
12” is “plus 12.”
Check
k – 12 = 4
16 – 12 = 4
4 = 4
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