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# Simultaneous equations Watch

1. Please can some one explain how to solve these simultaneous equations, to get the values of x and y :

y= 1/2(a half)x +2
2y+ 3x= 12
?

If so, you can sub in the first one into the second one. This will give you a number for x. Then you can sub this back into the first one to get a value for y.
3. With two linear equations, its best to use elimination rather than substitution. Rearrange the second equation to get 2y=...

So you either make the first equation or the second equation match either the x or y value by multiplying it. In your case i would multiply the first equation to make the x values the same

Then use the STOP method to work out if you have to add or multiply the equations (SameTakeaway/OppositePlus)
In this case, the signs are opposite, so add equation

Now we have our y value, sub y into one of the equations.

Then you should have both solutions.
4. (Original post by rachelw785)
...
Please read the Forum Rules at the top. You should not provide full solutions.
5. (Original post by rachelw785)
With two linear equations, its best to use elimination rather than substitution.
First ... This is poor advice
Second ... STOP is probably something your teacher uses but it is not an established term

Third ... And most important ... The rules of this forum ask that we do not provide full solutions

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Updated: January 11, 2015
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