UNDOING OPERATIONS
SO, HOW DO WE UNDO OPERATIONS?
First we need to understand what all of the operations that we will be undoing are.
So, the operations are:
So, how do we undo Addition?
By subtracting. Whenever you see a + sign and you want to undo it, you subtract whatever is being added.
An example of this:
0 = x + 23
If we want to know what x is, we undo the addition.
So we subtract 23 from the equation.
-23 -23
And we get that x = -23
Some Examples For undoing addition
4. x + 100 = 101
-12 -12
x = 24
-12 -12
x = -5
-5 -5
x = 7
-100 -100
x = 1
So how do we undo Subtraction?
With addition! Whenever you see a - sign and you want to undo it, you add whatever is being subtracted.
An example of this:
x – 20 = 35
If we want to know what x is, we undo the subtraction.
So we add 20 from the equation.
+ 20 + 20
And we get that x = 55
SOME EXAMPLES FOR UNDOING SUBTRACTION
+24 +24
x = 51
+ 50 +50
x = 53
+ 47 +47
x = 49
+57 + 57
x = 157