D. [tex]3 y^{3}x+9 x^{2} y-2 y^{2} -4x[/tex]
Take each term and find the degree of the term and then put them in order from highest to lowest:
[tex] y^{3}x=3+1=4 [/tex]
[tex] x^{2} y=2+1=3[/tex]
[tex] y^{2}=2 [/tex]
x=1
Remember a letter without an exponent is assumed to be a 1.
Hope that helps.
