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Subtracting equations is just another way to say subtracting equations with variables in them.

Like for example if we have the equation "y-4=15" with the variable y which is a lower-case letter.

To solve this we have to add since it is the opposite of subtraction and we have to add the +4 like this:

Like for example if we have the equation "y-4=15" with the variable y which is a lower-case letter.

To solve this we have to add since it is the opposite of subtraction and we have to add the +4 like this:

y-4=15

+4 +4

Now we are left with 15+4 since the 4's since -4+4 cut each other out like this:

y~~-4~~=15 = 15

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y = 19

So now we have a statement that says 15+4=19 and that y=19 and to find out if this is true we have to put our answer into the previous equation like this:

19-4=15

y=19

So this statement is true.

Now try some of these and make sure to watch the video on YouTube.

Now try some of these and make sure to watch the video on YouTube.

*Sheet 1 Subtracting Equations*

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