已知4x-5y+2=0,(9^2x)/3^5x的值为

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4x-5y+2=0
4x-5y=-2
(9^2x)/3^5y
=3^4x/3^5y
=3(4x-5y)
=3^(-2)
=1/9
请检查题是否有误

(9^2x)/3^5y
=(3^4x)/(3^5y)
=3^(4x-5y)
=3^(-2)
=1/9
求的项里面应该是5y吧