# How do I do algebra subsitution?

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How do I do algebra substitution?

Thanks

How do I do algebra substitution?

Thanks

##### 1 Answer

Jul 9, 2018

See below.

#### Explanation:

Suppose you are told that

**Substitute** the value for x that you know (because of the 2nd equation you were given) for the x in the first equation.

That completes the substitution. But you do not have a value for y yet. That requires another of algebra's tricks: do something that helps to both sides.

We now have

#2 + y - 2 = 6 - 2#

#" "" "y = 4#

I hope this helps,

Steve