How do you solve rational equations #x/2 = 4/7#?
2 Answers
Answer:
This is why cross multiply works
Explanation:
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.
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Given:
We need to 'get rid' of the
Multiply both sides by
But