How do you solve rational equations #x/2 = 4/7#?
This is why cross multiply works
You are very likely to have been shown this in school:
This is the cross multiply shortcut approach and I would recommend you use it as it is quite fast.
To 'get rid' of something that is multiply or divide turn it into 1
To 'get rid' of something that is add or subtract turn it into 0.
In doing this it turns up on the other side of the equals sign.
We need to 'get rid' of the
Multiply both sides by