Astudent said that 3x and 4y can be simplified to 7xy by combing like terms. what error did the student make?

Hello there.

A student said that 3x and 4y can be simplified to 7xy by combing like terms. what error did the student make?

The answer is quite simply that x and y are not like terms. You can only combine like terms. For example if it was 3 x and 4 x , then they could be combined. In short, x and y are not like terms.

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Where is the diagram