math
posted by I NEED HELP NOW!!:) .
How can you tell if an equation of a relation represents a linear relation?

THanks to everyon who helps :)

linear = first degree only, no squares, no cubes, no square roots,no products of variable.
so x+3y=c is a linear equation
x^3+y=c is NOT
x+12y=45 is linear
1+ xy=c is NOT 
thanks so much that helped me a lot !!
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