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# What to look for when solving simultaneous equations? (substitution method).

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1. Hi there .

Are there any rules for spotting the correct equation to use when solving by the substitution method?

So if you have your two equations. Are there things I should look for that will show me which I should use to sub into the other equation?

Hope that makes sense.
2. (Original post by makin)
Hi there .

Are there any rules for spotting the correct equation to use when solving by the substitution method?

So if you have your two equations. Are there things I should look for that will show me which I should use to sub into the other equation?

Hope that makes sense.
If you're dealing with linear equations only then rearrange an equation to get either or . Doesn't really matter but I'd go for the easiest looking then substitute it in to the other.

If you have a quadratic and a linear, rearrange the linear equation to get or and substitute it into the quadratic.

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