Question: Is there any Maple command to detect whether the degree of a polynomial w.r.t. all variables is less or equal 1?

Is there any Maple command to detect whether the degree of a polynomial w.r.t. all variables is less or equal 1?

For example, if $f=ax+by-1$ when $x$ and $y$ are variables then the output is true and if $g=a*x^2+b*y-c$ then it returns false. 

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