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## Summary:

- why one variable linear equation called linear?

i get preparation for my university entering exam and i studying linear equation and they define it linear equation are those which graph line now my question is that why one variable linear equation called linear for example y=3 that actually give us just line why we draw line for this equations?

2- is 10/x=2 is linear equation and is square root of (y-9)=10 is linear if no why these equation are not linear?

2- is 10/x=2 is linear equation and is square root of (y-9)=10 is linear if no why these equation are not linear?